I just did a test registration and everything seemed to be ok.
If you were entering something in the referral field then that could have been the problem.
The referral field is used for special voucher codes, or the name or email of an existing customer that directed you to our site.
If you have no code or no one sent you here it should be left blank.
Glad to see it was resolved over the phone and hope you enjoy your Handpresso!