That is a known bug with Compact Headers and UBBâ„¢ 6.04f and higher. Look in the Templates forum for the Compact Headers v1.5 Final topic, and jump to the last page (or maybe next-to-the-last, depending on how things went when the posts per page count got dropped). AllenAyres (I think) posted the fix for this problem.
The bug will not be present in the 6.1.0 version of Compact Headers.
---Skorpion