hm.. It's in a private Site.. I can't give this link here... there is a lot of personally stuff on this domain... But for what you need it? You will only see what is on the screenshot above...
What we could do with a link, would be to analyze what's happening by (viewing the source) using something like the Firebug extension for Firefox. We could then see all the html and css around that portion of the page that's causing the misplacement.
Another thing you could do is recreate the problem on a different website (or subdirectory) by installing all the addons, themes, styles, etc. in the private forum. Then we could see it in action.
Ah, okay I understand. Well, I have to put the site on a new server (with a public domain) in a few days... (now it's on my personal site for testing and solving such problems). Then I will post the link here and you can test it with all your tools..