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).
Or it was disabled in the browser's settings.
Slow internet connection can lead to the same error too.
Looks like the problem is in your end. @nc50lc already give you the possible reasons why you have this sort of problem. I suggest you try other PC/Laptop and try if its loads nicely.