When looking at a topic, the first post is connected with the rest of the posts so that you cannot see the first post when on a different page other than the page that the first post is on.

I think that was changed intentionally a long time ago. It was kind of annoying...

I do not think so. It was doing that only yesterday for me. Maybe I did not explain it clearly.

The first post is usually not connected to the rest of the topic, there are page numbers below it. I was on yesterday and the first post became connected to the rest of the topic, no page number links below it or anything.

-EDIT-
Anyway, it's fixed now.