WP_Query inside foreach loop returning same value for all options when filtered using ajax

If anyone is interested in how to achieve the result for the question I posted, I managed to work it out!

As the correct results we’re being displayed, but for each iteration of the foreach loop rather than the specific day, I managed to get the results to display/hide by using if (is_object_in_term($class->ID, 'calendar-day', 'monday') && $day->term_id == 6) . is_object_in_term checks if the $taxonomy are checked against the object’s terms’ term_ids, names and slugs and $day->term_id for each of the days. If it doesn’t then nothing is displayed.

I’ve had to hardcode each day of the week and the code to generate the result. I know this isn’t the best D.R.Y approach, but at the moment i’m happy with the current win! 

add_action('wp_ajax_classfilter', 'load_posts_by_ajax_callback');
add_action('wp_ajax_nopriv_classfilter', 'load_posts_by_ajax_callback');

function load_posts_by_ajax_callback() {

  check_ajax_referer('load_more_posts', 'security');

  $days = get_terms([
    'taxonomy' => 'calendar-day'
  ]);

  // Loop over days of the week
  foreach ($days as $day ) {

    $classesTable .= '<div class="response classes-col">';

    $classesTable .= '<strong>' . $day->name . '</strong>'; // Day name

    // Query arguments based on day of the week
    $args = array(
      'post_type' => 'calendar',
      'meta_key' => 'classes_entry_start_time',
      'orderby' => 'meta_value_num',
      'order' => 'ASC',
      'numberposts' => '-1',
      'tax_query' => array(
        array(
          'taxonomy' => 'calendar-day',
          'field' => 'id',
          'terms' =>  $day->term_id
          // 'terms' => array('6', '7', '8', '9', '10', '11', '12')
        )
      ),
    );

    if(isset( $_POST['theClass'])) {
      $args['tax_query'] = array(
        array(
          'taxonomy' => 'calendar-class-type',
          'field' => 'id',
          'terms' => $_POST['theClass']
        )
      );
    }

    $query_classes = get_posts( $args );
    $classesArray = array();

    // Loop over query classes posts
    foreach ($query_classes as $key => $class ) {

      // Check if object has term: Monday
      if (is_object_in_term($class->ID, 'calendar-day', 'monday') && $day->term_id == 6):
        // $classesArray[] .= 'YES';
        $start_time = get_field('classes_entry_start_time', $class);
        $end_time = get_field('classes_entry_end_time', $class);
        $classesEntry = get_field('classes_entry', $class);
        // Create class item
        $classesArray[] .= '<li>';
        $classesArray[] .= '<a href="' . $classesEntry['booking_app_link'] . '" target="_blank" class="classes-item">';
        $classesArray[] .= '<span>' . $classesEntry['start_time'] . '</span>';
        $classesArray[] .= '<span>' . $class->post_title . '</span>';
        $classesArray[] .= '<span>' . $classesEntry['duration'] . '</span>';
        $terms = get_the_terms( $class->ID , 'calendar-class-type' );
        if ($terms): foreach ( $terms as $term ):
        $classesArray[] .= '<span>' . $term->name . '</span>';
        endforeach; endif; 
        $classesArray[] .= '</a>';
        $classesArray[] .= '</li>';
      else: 
        // Show nothing
        // $classesArray[] .= 'NO';
      endif;

      // Check if object has term: Tuesday
      if (is_object_in_term($class->ID, 'calendar-day', 'tuesday') && $day->term_id == 7):
        // $classesArray[] .= 'YES';
        $start_time = get_field('classes_entry_start_time', $class);
        $end_time = get_field('classes_entry_end_time', $class);
        $classesEntry = get_field('classes_entry', $class);
        // Create class item
        $classesArray[] .= '<li>';
        $classesArray[] .= '<a href="' . $classesEntry['booking_app_link'] . '" target="_blank" class="classes-item">';
        $classesArray[] .= '<span>' . $classesEntry['start_time'] . '</span>';
        $classesArray[] .= '<span>' . $class->post_title . '</span>';
        $classesArray[] .= '<span>' . $classesEntry['duration'] . '</span>';
        $terms = get_the_terms( $class->ID , 'calendar-class-type' );
        if ($terms): foreach ( $terms as $term ):
        $classesArray[] .= '<span>' . $term->name . '</span>';
        endforeach; endif; 
        $classesArray[] .= '</a>';
        $classesArray[] .= '</li>';
      else :
        // Show nothing
        // $classesArray[] .= 'NO';
      endif;

      // Check if object has term: Wednesday
      if (is_object_in_term($class->ID, 'calendar-day', 'wednesday') && $day->term_id == 8):
        // $classesArray[] .= 'YES';
        $start_time = get_field('classes_entry_start_time', $class);
        $end_time = get_field('classes_entry_end_time', $class);
        $classesEntry = get_field('classes_entry', $class);
        // Create class item
        $classesArray[] .= '<li>';
        $classesArray[] .= '<a href="' . $classesEntry['booking_app_link'] . '" target="_blank" class="classes-item">';
        $classesArray[] .= '<span>' . $classesEntry['start_time'] . '</span>';
        $classesArray[] .= '<span>' . $class->post_title . '</span>';
        $classesArray[] .= '<span>' . $classesEntry['duration'] . '</span>';
        $terms = get_the_terms( $class->ID , 'calendar-class-type' );
        if ($terms): foreach ( $terms as $term ):
        $classesArray[] .= '<span>' . $term->name . '</span>';
        endforeach; endif; 
        $classesArray[] .= '</a>';
        $classesArray[] .= '</li>';
      else :
        // Show nothing
        // $classesArray[] .= 'NO';
      endif;

      // Check if object has term: Thursday
      if (is_object_in_term($class->ID, 'calendar-day', 'thursday') && $day->term_id == 9):
        // $classesArray[] .= 'YES';
        $start_time = get_field('classes_entry_start_time', $class);
        $end_time = get_field('classes_entry_end_time', $class);
        $classesEntry = get_field('classes_entry', $class);
        // Create class item
        $classesArray[] .= '<li>';
        $classesArray[] .= '<a href="' . $classesEntry['booking_app_link'] . '" target="_blank" class="classes-item">';
        $classesArray[] .= '<span>' . $classesEntry['start_time'] . '</span>';
        $classesArray[] .= '<span>' . $class->post_title . '</span>';
        $classesArray[] .= '<span>' . $classesEntry['duration'] . '</span>';
        $terms = get_the_terms( $class->ID , 'calendar-class-type' );
        if ($terms): foreach ( $terms as $term ):
        $classesArray[] .= '<span>' . $term->name . '</span>';
        endforeach; endif; 
        $classesArray[] .= '</a>';
        $classesArray[] .= '</li>';
      else :
        // Show nothing
        // $classesArray[] .= 'NO';
      endif;

      // Check if object has term: Friday
      if (is_object_in_term($class->ID, 'calendar-day', 'friday') && $day->term_id == 10):
        // $classesArray[] .= 'YES';
        $start_time = get_field('classes_entry_start_time', $class);
        $end_time = get_field('classes_entry_end_time', $class);
        $classesEntry = get_field('classes_entry', $class);
        // Create class item
        $classesArray[] .= '<li>';
        $classesArray[] .= '<a href="' . $classesEntry['booking_app_link'] . '" target="_blank" class="classes-item">';
        $classesArray[] .= '<span>' . $classesEntry['start_time'] . '</span>';
        $classesArray[] .= '<span>' . $class->post_title . '</span>';
        $classesArray[] .= '<span>' . $classesEntry['duration'] . '</span>';
        $terms = get_the_terms( $class->ID , 'calendar-class-type' );
        if ($terms): foreach ( $terms as $term ):
        $classesArray[] .= '<span>' . $term->name . '</span>';
        endforeach; endif; 
        $classesArray[] .= '</a>';
        $classesArray[] .= '</li>';
      else :
        // Show nothing
        // $classesArray[] .= 'NO';
      endif;

      // Check if object has term: Saturday
      if (is_object_in_term($class->ID, 'calendar-day', 'saturday') && $day->term_id == 11):
        // $classesArray[] .= 'YES';
        $start_time = get_field('classes_entry_start_time', $class);
        $end_time = get_field('classes_entry_end_time', $class);
        $classesEntry = get_field('classes_entry', $class);
        // Create class item
        $classesArray[] .= '<li>';
        $classesArray[] .= '<a href="' . $classesEntry['booking_app_link'] . '" target="_blank" class="classes-item">';
        $classesArray[] .= '<span>' . $classesEntry['start_time'] . '</span>';
        $classesArray[] .= '<span>' . $class->post_title . '</span>';
        $classesArray[] .= '<span>' . $classesEntry['duration'] . '</span>';
        $terms = get_the_terms( $class->ID , 'calendar-class-type' );
        if ($terms): foreach ( $terms as $term ):
        $classesArray[] .= '<span>' . $term->name . '</span>';
        endforeach; endif; 
        $classesArray[] .= '</a>';
        $classesArray[] .= '</li>';
      else :
        // Show nothing
        // $classesArray[] .= 'NO';
      endif;

      // Check if object has term: Sunday
      if (is_object_in_term($class->ID, 'calendar-day', 'sunday') && $day->term_id == 12):
        // $classesArray[] .= 'YES';
        $start_time = get_field('classes_entry_start_time', $class);
        $end_time = get_field('classes_entry_end_time', $class);
        $classesEntry = get_field('classes_entry', $class);
        // Create class item
        $classesArray[] .= '<li>';
        $classesArray[] .= '<a href="' . $classesEntry['booking_app_link'] . '" target="_blank" class="classes-item">';
        $classesArray[] .= '<span>' . $classesEntry['start_time'] . '</span>';
        $classesArray[] .= '<span>' . $class->post_title . '</span>';
        $classesArray[] .= '<span>' . $classesEntry['duration'] . '</span>';
        $terms = get_the_terms( $class->ID , 'calendar-class-type' );
        if ($terms): foreach ( $terms as $term ):
        $classesArray[] .= '<span>' . $term->name . '</span>';
        endforeach; endif; 
        $classesArray[] .= '</a>';
        $classesArray[] .= '</li>';
      else :
        // Show nothing
        // $classesArray[] .= 'NO';
      endif;


    }

    // Display all queried class results
    $classesTable .= '<ul>' . implode(' ', $classesArray) . '</ul>';

    $classesTable .= '</div>'; // END classes-col
  }

  echo $classesTable;

    wp_die();
}

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