When I click the "View first unread post" button on some threads, it sometimes won't take me to the latest post, but sometimes a post a few pages back. I don't know what causes this, but it caused a mistake on the add a word to the story thread once, xD.
Does anypony else experience this?

I guess its because if there are posted too many replies, you may read the newers ones and still leave the ones before them unread.

Let's say you log out and when get back a thread has gotten 7 more pages of replies.
If you only read the ones on the newest page, page 7, then the older ones will remain unread.

Oh.