Ie9 Scrolling Bug (border Line Repeated On Screen)

I'm doing a DHTML popup where there is a UL with left floated LI's, that show a list of embroidery designs. In ie9 (does not effect <=IE8) when you scroll down in the UL all of

Solution 1:

Credit to Matt K for helping me realize what the problem might be... The apparently this is a GPU / Driver issue as when I disabled hardware rendering under advanced in internet options, restarted the browser the issue disappeared.

Aiken to the FF hw acceleration, my crappy intel gpu chipset on my laptop causes things to break when hardware acceleration is turned on... I'm going to have to test this at home now, with my tower that has a much better gpu.