the main page
It looks like the browser's fault.
The CSS style wasn't loaded after the HTTP script, the javascript was not initiated either.
Failed registration/fill-up forms can be blamed to javascript errors.
That usually happens when the browser doesn't support Javascript, CSS scripts and javascript (
ex. Mobile browsers, Opera Mini/ I said javascript 4times/ no I didn't).
Or it was disabled in the browser's settings.
Slow internet connection can lead to the same error too.