Sounds like one of the bugs that crept in to some of the skins I made. Are you using Plain? Here are the instructions for fixing this:

http://skins.b2evolution.net/skins.php?title=simple_1&more=1&c=1&tb=1&pb=1#c81

Did you just download this skin recently?

Probably, I still haven't fixed it. If someone wants to send me a zip that I can just upload without checking for 0.9.0.12 (and a 0.9.1 version would be good - of any skin), I'd be eternally grateful. V busy at the moment with work and uni.

This should be a good copy:

http://www.brendoman.com/b2e/skins/plain.zip