That was a fun subject title. Anyway...

When you are on the second page of any thread, the [b]Prev Page[/b] button of the second pagination set at the bottom of the thread will reload page 2 instead of returning to the first page. 

This issue is present everywhere the second pagination set is rendered. This is only true for the [i]bottom[/i] pagination set, and only on page 2. The top pagination set works properly. Pages 3 + all work properly.