Hi,
The problem is indeed not with HikaShop. The address edition popup works on everyone else's website.
You indeed corrected the javascript errors. But the modal system of joomla is still not working properly on your website.
See HikaShop just tells the joomla modal library to display a popup and give the link of the page to be displayed in the popup. Then, the modal library handles the rest. If that doesn't work, it means that there is something interfering with the modal system of joomla on your website.
If you want a proof, install a blank joomla website with HikaShop. There is no way that the popup doesn't work...
There is a high chance that it comes from another script on the page or maybe a javascript modification that you made somewhere.