Hi,
In the product page the popup works perfect! There is no javascript error.
No popup in the "variants" it is a full screen with the hikashop upload map.
I tested on many different locations, browsers and PC systems. Everywhere the same result and no error.
In my office the browser, java and javascript works up to date.
So i think somewhere in my configurations is wrong. On your demo the popup variants works good but there no more configurations access.
i can work but it is not nice every time to force the browser 2 pages backwards.
see the configuration-display-image attachment
best regards Marius