wow I love all the help I'm getting on these forums. makes switching to nginx so much easier

anyway, i have a problem. nginx is working great but periodically things get reqlly messed up. like this page

http://www.sociology.org.

after I posted a new article on that site, the page output got really messed up. (image attached). i tried everything including rebooting the server. WTF is this and why does it happen?

It looks fine from here