Hi,
Could you provide a screenshot of your problem ?
I think that, you could display the classical Joomla registration and not the HikaShop registration.
During the checkout, the address could be hidden by a css rule or by view override. So, even if your configuration looks good (but we do not see all of your configuration), the rest could be wrong.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.