When viewing threads with for example 26 replies, there is no link to the second page in the blue row with the title, it does not come until the post count goes up to 27, this also happens with threads that are 'moving on to' 3 pages and infact all pages.
Simply, if there is just one post on the next page the board acts as if that page didn't exist.
This is a bug in the forum software itself I believe. It only happens when there's one reply on the last page (for example, when a thread has 26, 51, or 76 posts, etc.). It's been a problem for a while now, and the staff is aware of it. As far as a fix, I'm not sure; I'll leave that question to a staff member who's more familiar with the system's inner workings .