Hi,
Note first that I wasn't able to reproduce the issue on my end on your website with either Edge or Chrome.
While your issue looks similar for the user, the error is totally different.
As you can see in your video, you have the error :
Access to XMLHttpRequest at xxx from yyy has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.
From what I can read online it's something that can be fixed at the server level. It's probably because the URL for yyy has www. while the URL for xxx doesn't have the www.
It might be an issue with the live parameter of the configuration.php file of your Joomla, but it might also be solved by redirecting non www URLs to www URLs in your htaccess. That's a common thing:
www.joomlashack.com/blog/joomla/www/
I don't think there is anything we can do in HikaShop to fix that.