Thanks for getting in touch with us. My name is Muhammad and I will be your support rep.
I was going to test checkout so I can see why the shipping option for Spain is not working but I am not able to add the product to the cart, I see the Ajax does not work on your website, please see a short video I have made: https://share.getcloudapp.com/E0u992Am
Can you please confirm if you see the same issue?
Please also share your WordPress admin login details so I can debug the issue with shipping and with Ajax as well.
