Hello,

As you are using a third party plugin “Woocommerce Quick Buy” and it’s not working in your site.

Actually this is beyond our support policy as this is not related to our theme this is related to a third party plugin. And we did not test this plugin in our theme.

But you can try the following way to fix it. That might works in your case:

1) You can try with disabling the AJAX add to cart from the Theme Settings >> PRODUCT PAGE >> AJAX Add to cart. And then check the quick buy from product page if it works.

Best Regards.