We have 3 different themes to choose from. Default xenforo theme is one, the other two are pro themes. You can change this in your preferences.Oh, Xenforo. So this is what people were complaining to me the other day about.
I have to agree with them 100%. This looks and feels absolutely terrible. Days gone by this is what it would look like when Internet Explorer 6 failed to properly parse a CSS and made everything awkward looking.
No errors, but it resembles the mangled mess that resulted when my site gets an error.