I'm finding myself incapable of reproducing this. I've probably refreshed your page 100 times and cleared my cookies on it a solid 10.
Even looking at the code, I'm not seeing anything that would typically point to that kind of problem.
Could you post a screenshot of the problem?
Also, could you try the following? If you get the error again, try going to
http://dkpfiles.com/prophecyguild/style.css and let me know what shows up.
This sounds to me like for whatever reason, it's not loading your CSS.