Are you noticing that on the bugs forum Ruben? This can be a bit misleading on forums with subforums. For example, for me there were 2 unread posts in the Non-bugs subforum. I made a post in the bugs forum and went back to the main forum sublisting. The last post was listed by me, and had the new post indicator on. The new post indicator was on because of the 2 new posts in the subforum, even though they were older than my new post.

Hopefully that makes sense. Last post link is for the actual last post in any of the forums/subforums. New post indicator will be on if there are any unread posts in any of the subforums within.