FF3 CSS Refresh Issue

I made a collapsible panel with JQuery to mimic the asp.net ajax toolkit collapsible panel. it works great on a test page, but when I create 8 of them on a more complex page they leave a white space in FF3 when collapsed. If I disable any css style using firebug the white space is removed. So it seems like a css refresh issue.

Has anyone ever experienced this? Or, know how to fix it?