Hi,
The popup problem comes from your bootstrap template. It does not includes the CSS rules for the modal popup.
Several thread talk about it, like this one:
www.hikashop.com/en/forum/4-how-to/81220...ap-popup-broken.html
Edit: I test your website once again and the buttons works on Chrome/Firefox. It is just that the popups are not displayed correctly due to a CSS problem.
Even in chrome, if you click on the "shipping" button, the popup will appear at the bottom left of the web page.
This popup problem will appear in HikaShop too.
If you want to force the mootools popup in HikaShop/HikaMarket, it is possible.
You have to change the "popup mode" in the HikaShop configuration (tab "display").
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.