I can help you to fix that issue, just contact me on mail because, I have to check in theme code and debug it to find exact issue.
For that case can you provide me the ADMIN Collaborator request? Once I got access then I can check the code from the backend, because I have checked your site and product add to cart is working fine.
I'm having the same problem here since yesterday.. I thought it was because an app I installed and uninstalled yesterday, but I don't think so because even on previous saved copies of my theme the "add to cart" button still doesn't work and keep loading.
My store is www.vegancases.com
I hope you can help me please.
Thanks in advance 🙏