WP_Query shows all posts on single post pages

please modified yoy loop to display single post which you have coded in single.php file

<?php
        // Start the loop.
        while ( have_posts() ) : the_post();

        /*
         * Include the post format-specific template for the content. If you want to
         * use this in a child theme, then include a file called called content-___.php
         * (where ___ is the post format) and that will be used instead.
         */
        get_template_part( 'content', get_post_format() );

        // If comments are open or we have at least one comment, load up the comment template.
        if ( comments_open() || get_comments_number() ) :
            comments_template();
        endif;

        // Previous/next post navigation.
        the_post_navigation( array(
            'next_text' => '<span class="meta-nav" aria-hidden="true">' . __( 'Next', 'twentyfifteen' ) . '</span> ' .
                '<span class="screen-reader-text">' . __( 'Next post:', 'twentyfifteen' ) . '</span> ' .
                '<span class="post-title">%title</span>',
            'prev_text' => '<span class="meta-nav" aria-hidden="true">' . __( 'Previous', 'twentyfifteen' ) . '</span> ' .
                '<span class="screen-reader-text">' . __( 'Previous post:', 'twentyfifteen' ) . '</span> ' .
                '<span class="post-title">%title</span>',
        ) );

    // End the loop.
    endwhile;
    ?>

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