The site is not loading properly because of a 500 internal error on jQuery.
I've never seen that before. I've seen it on PHP and stuff, but not on jQuery.
Also some classes don't load like `btn-success` but that's ok I can just add them in, just letting you know in case it's important.
I'm having some weird row issue too.
Again not important I can fix it, just reporting in case it's important.
The checkout issue is important it's stopping the checkout.
I'll raise a ticket with my host too.
I checked here and I have done all those items already: https://docs.j2commerce.com/j2commerce/getting-started/technical-requirements
