Comments section is behind post/sidebar

I’m working on a custom theme with a friend, and even though we’re doing things the same way we did on another theme that works just fine, this time the comments section in kinda behind the post and the sidebar as well. Not the written part, just what would be the “box” for the comments.

My css for the comments and single pages is:

The comments.php template looks like this:

[Excessive code removed – please see the forum guidelines re posting code and use a pastebin for large amounts of code]

When I removed the <?php get_related_posts_thumbnails(); ?> from the <div class="newsmain"> with the post and put it into its own <div class="newsmain">, the comments stopped from going behind the main post, and now only shows up behind the plugin – but it’s still behind the sidebar as well.
I tried inserting empty <div>’s before <?php comments_template(); ?>, and well as around it, but still no luck.

The site is offline, so here’s a screenshot of how it’s looking like: https://img836.imageshack.us/img836/1843/eezk.jpg

Does anyone have any clue as to what might be the problem?
Thanks!