The pagination seems to be screwed up in threads sometimes. I've noticed it in a couple of threads, but specifically in the "C book recommendations" sticky.
Here's what I mean,
"One" is the page 8, however if you click page 9, you're taken straight back to page 8. Even the tooltip is wrong
I couldn't find anything about the bug on the interzweb, maybe I didn't look hard enough. Probably fixed in vBulletin Version 4.0 but who knows.
"Tooltip for page 9", Tooltip says "Show results 121 to 121 of 121" -- makes sense
"Click page 9" -- takes you back to page 8.