Cannot create account with Membership Pro 2

Having an issue where users cannot sign up. Simply follow the “Account” tab in the menu, and attempt to sign up for a subscription. Annual was what was tested. When you’re done submitting your account information (name, username, etc), the form will simply refresh the same page and form, blank. It doesn’t go or do anything.

Any ideas? Support access has already been granted, if that helps. Site is live at http://preservationartisans.org