WordPress Theme Error - Thumbnail Incorrect Loading

So for example I have the following code: $posts = get_posts($args); foreach ($posts as $post) { // echo $counter; setup_postdata($post); echo '<a href="'.get_the_permalink($post).'"><div class="col-xs-12 building-talent-news" style="background-image : url('.get_the_post_thumbnail_url($post , 'large').')"> <div class="building-news-txt"> <h4>'.get_the_title().'</h4> </div> </div></a>'; } For some reason the correct thumbnail is initially loaded and then the browser makes another request and replaces it. All my thumbnails on the page are the same thumbnail! So I need someone to look into this. Budget is $20USD - should only take you a short time to have a look. I will provide FTP details etc. I am looking for an experienced WordPress developer, if I don't think you have read this brief then I will not even consider hiring you. Please make sure that I understand that you have indeed read this brief and you understand the problem.