Hello,
Clear the browser cache to get normal view of the add to cart button. I checked it and add to cart option and it’s ok https://gyazo.com/8387e1ba079f858f4c1064693f7aadd7
Also, our theme supports PHP 7.4, so update your PHP to 7.4 and reply back if you get the error. Provide FTP access. We’ll check it in more detail.
Regards
