Why does this random, unexpected horizontal line appear in IE7?

I am using YUI's datatable (http://developer.yahoo.com/yui/datatable/) to make a table. But notice something very wrong...sometimes, there is a line that appears on top of a res开发者_如何学运维ult, only in IE7.

This may or may not be related to the YUI plugin. Does anyone know how to fix this? Thanks.!

Edit: For some reason, it only appears at that pixel. (not necessarily at that result...but at that height from the top)

Check THe html code is there any difference for that row ? any at all.