Odd meta tag problems

I am having a very odd problem with my site http://www.creativemonkeys.org
When I try to share the front page on facebook, I not only get no image, the link it shows points to my sitemap, which looks just empty and sad.

Checking the header with firebug, I can see that there are several wp_head functions called on. But what is odd that it does so even if I disable all my add ons. They still load their wp_head functions into the header.
On of them seems to be metadata for facebook relegating to crativemonkeys.org/site which I guess is the culprit, but I can’t find out, where it is coming from. It occurs even if all my plug ins are disabled.

Originally I thought it would be a caching plug-in I used, but I uninstalled that and all remembrance of it.

Any Idea what could cause this? Thanks!