'posts_per_page' => 10 doesnt show 10 post?

Hi.
Ive made a “post per page ” limitation with category “Actors” based filtering. The problem is, this code checks the last 10 post and show only the ones with the “Actors” on it; which in result shows 3 or 4 posts.

But i only want to show 10 “Actors” posts rather than the otherway around. Can you please help me?

<?php
    $loop = new WP_Query( array( 'post_type' => 'post', 'posts_per_page' => 5) );
    while ( $loop->have_posts() ) : $loop->the_post();
     if(get_field('Actors') )
     {
            echo '<li>';
            echo '<a href="';
            the_permalink();
            echo '">';
            the_title();
            echo '</br><span> ';
            the_time('d/m/Y');
            echo '</span></a></li>';
    }else{
            echo '';
    }
        endwhile;

    ?>

Note: “if(get_field(‘Actors’)” is a custom field, and i think this problem is not occuring due to this ( since ive also tried has_term version.)

Thank you.