I just hit 3000rep and noticed that if you are scrolled down a little bit on the Review Close Votes page, and select "Close" you get this incorrect hovering:
It is covering up a couple options.
Not sure how to fix it, because i didnt dive into the HTML and stuff.
This is reproducable while scrolled partially down the page and clicking "Close" in Google Chrome version 23.0.1271.64 m
It stays behind the red pop-up, until the page is scrolled far enough down that the "Should this question be closed" box starts to move with the page, at which point it comes on top.
p.s: I realize that i can just hit "less" , however the "Should this question be closed..." would still be on top, and it is still incorrect behavior.