Wildcard SSL, and everything else is correct but I still get errors when upgrading in pro sites

Ok so I got my wildcard ssl and put paypal in sandbox mode in Pro Sites, then I went to my signup form: http://hawpress.com/wp-signup.php?hawpress-sites=1 and made a site, that went perfectly. Then I proceeded to upgrading the test account to a paid subscription and I clicked the pay with paypal link and the page just reloaded, then I tried to use the form bellow for debit/credit cards and the same thing happened when I tried to upgrade again. It’s not letting me upgrade to another package.

I need help with this issue, it is that last of the issues i am having!