WP_Query with Pagination and orderby meta_value_num showing duplicates

$paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
  $args = array(
    'tag' => $taxonomy,
    'post_type' => 'initiative',
    'paged' => $paged,
    'posts_per_page' => 9,
    'category_name' => $category,
    'tag__not_in' => array(15),
    'meta_key' => 'initative_weight',
    'orderby' => array('meta_value_num' => 'DESC', 'title' => 'ASC'),
    'post_status' => 'publish'
  );

I changed tag__not_in to an array and updated the orderby to be an array as well.