Hi,
I think you have some troubles with the Joomla popup system.
Because you did not provide your joomla version it will be difficult to give you more details.
But if you change the popup mode in your HikaShop configuration, it could help.
Otherwise, you will have to test if your template can display Joomla popup correctly.
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.