There's 5 hidden posts in that thread so it should only be caused for the post count groups of 15-25 (e.g. 35-45, 55-60) . Unfortunately while hiding posts removes them form your view the counter still includes them in the post count and thus tries to generate a new post based on the total count. That's why it gives you the phoney next page. Right now there's no real solution for it other than to unhide the posts which have some explicit language or you might just have to bear with it until Mahz can get around to it. Fortunately it's not in your IC like some other RPs have.

Some of the posts can be unhidden if it really bothers you - just be aware that they're troll posts (that you've seen already) but then again it's on a page of the OOC with no CSes nor important information. On the other side of the spectrum we could try hiding 20 posts so the error won't be caused at all but that'll remove a significant chunk.