Hi,
The page you are using is to access "My Account" page, since the user is not logged in, the page includes the "Login Panel" at the top.
Use one of these URLs below for the "Shopper Registration Form" instead:
yourdomain.com/index.php?option=com_virtuemart&view=user&flexible=register&task=editaddresscart&addrtype=BT
- or -
yourdomain.com/index.php?option=com_virtuemart&view=user&task=editaddresscart&addrtype=BT
Regards,
Support