A user flagged a post letting us know about issues with the layout of the comments area which sometimes gets broken. I was able to reproduce the problem so here it goes. A screenshot bellow which shows the problem on the page where it was reported. And the first comment to this question is the text that seems to trigger the problem.
I was able to reproduce the problem both on Chrome (8.0.552.231) and Safari (5.0.3) on OSX (10.6.5).