When I open the top page in Firefox 3.6.12 or Firefox 4.0 Beta 7 on Windows 7, a question with both an interesting tag and an ignored tag is shown in a strange way; it seems that something is wrong with ClearType.
This does not reproduce with IE 8 or Chrome 7.0 on the same system. Therefore, I suspect that this may be an issue with Firefox rather than an issue with the website. Despite this, I am posting this issue because (1) I am not completely sure about the cause and (2) even if it is an issue with Firefox, some workaround on the server side might be possible.
Screenshot (click for the original size):