Having problems setting up my Obligatory Questions in User Profile?

I have set up some question in the User Profile and I made these questions obligatory (*) so they have to be answered before they can click on to sign up, but the problem I have is that I test the User Profile to make sure it worked, and well the obligatory questions just get by passed? Why is that?

Need to have these question setup so that the member has to answer these questions or they cannot sign up unless these all question are answered!

Thank You