FixedHeader issue

I'm having an issue with HTML rendered reports in Report Manager related to the FixedHeader property. When at the top of a page, the column headers align correctly with the columns. However, after scrolling far enough to "lock" headers, some of the column headers jump over to the right. The movement is most pronounced with the right-most columns. The left-most columns move very little, if at all. So reports with few columns do not have much of a problem. Howver, some of the reports with 10+ columns look pretty bad.

Anyone else seen this?

[567 byte] By [ToddKitta] at [2007-12-25]