Can't finish registration (new user gets made but subscription/member level doesn't get ad

Trying to set up and configure Membership… when I try to register at I can set up the user account, but when it gets to this url:

1) the “submit” button from the free gateway shows up twice

2) when I click it, it goes back to and says “Please check the details of your subscription below and click on the relevant button to complete the subscription.” and “You will pay :” — there’s no price, and no buttons. What happens next?