Hello, Chris,
Thank you for reaching out to us.
“The problem is that when you click on Add to Cart on a product, the side cart doesn’t open” – here is what we see on your site – https://gyazo.com/a7c508c9751aeac51293f7f3b25f5932
If you have any additional questions or concerns, please do not hesitate to reach out to us. Our support team is always available to assist you.
Best regards,
8Theme’s Team