What you are seeing there is XenForo without CSS - I'm not entirely sure why your site is allowing the page to be rendered before CSS has been loaded though.
The site loaded and worked fine for me...i could only get it to display like that by clicking refresh then stop super quickly.
It does not do for at any other xenforo installation I have tried so far though so yeah....i don't have an answer or anything just adding what I saw.
Well that is a line of code that i pretty much see in every xf installs source code being different for each site of course. (xenxero is my domain, I thought I changed all references in the code here but apparently not) I also messed it up pasting it in..