Hi,
It looks like you have a problem with your popups.
Please change the popup mode in your HikaShop configuration (Display > General display option > Popup mode = bootstrap).
It should fix the issue with your popup and also with the "terms & cond" link which is not correctly managed by your template.
( due to the "class modal" : you will find plenty of thread already talking about this problem )
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.