No Comments appear until manual refresh of the page

My wp-comments-post.php

$location = empty($_POST['redirect_to']) ? get_comment_link($comment_id) : $_POST['redirect_to'] . '#comment-' . $comment_id;
$location = apply_filters('comment_post_redirect', $location, $comment);

wp_safe_redirect( $location );
exit;

Have you tried temporarily switching to the Twenty Eleven theme to rule out any theme-specific problems?

Yes I did – the strange thing, the redirect works on Twenty Eleven but the same problem still exists, the comments only appear after a ctr+F5 refresh of the page. Maybe something is damaged at my .htacces or WordPress core files?

Are you running an caching plugins? Is your browser caching pages?

I don’t run a caching plugin on the website and I tried deactivating all currently running plugins but no results. I did clear my browser cache, tried different browser (Chrome, FF, IE, Safari) and tested from different computers – still I don’t know whats causing this trouble.

And I already read https://codex.www.ads-software.com/I_Make_Changes_and_Nothing_Happens

I wrote my Hoster an email if he is able to deactivate the Varnish Cache, but I am not 100% sure if its the true problem – since the proper display of the comments worked 3 days ago. Any other suggestions whats maybe causing the problem? (If its the Varnish Caching I will reply)

Okay I solved it

The problem was nothing with wordpress, themes or plugins it was simply the Varnish Cache – I asked my hosting provided to whiteliste my site and now all is working the way it should.