Fix me a bug in the back end area for customers with purchases done.

I own a website, there is a back end (members area) for admins,moderators and customers. A few days ago the customers members area if it has a purchase done randomly became basic html without loading any php or css in it (see the link). To understand more please login here with username " Customer " and password " test22" And log out and login again with username " Test22" and password " test22" [login to view URL] The first account ( Customer ) has a purchase done and the second account doesn't. When you login both accounts you will understand what I am talking about.