Thread:Project:Support desk/Possible CSS Error

I recently switched my wiki's host (following MediaWiki's guide). Everything went well, except for one slight visual error that might be a CSS problem. About 60% of the time when loading a page on my wiki, it looks like this. The other 40% it's fine and looks normal. I've switched themes thinking it might just be a specific theme, but it happens in Vector and the custom themes I've tried. Take a look: wiki.tngaming.com. Any help is appreciated.

Technical information

MediaWiki Version: 1.21.1

PHP Version: 5.3.13

MySQL Version: 5.5.32