If your talking about the toolbar... Might want to read this Toolbars aren't a good thing to have.
But if your talking about a visual defect, it might be your video card/monitor since that screenshot looks fine. Sort of like when my monitor broke and half of it was bright white. Couldn't take a screenshot because it doesn't copy what the actually monitor looks like.
I'm on a page about incorrect corrections, and spent the better part of like two hours trying to get someone to understand that -5^2 = -25, not 25, and then that post had comments get reposted because that group is self sustaining, and that person was in turn trying to explain what I just explained to them. And I'm taking that as a victory