Not working in variable products

Hello Sir,

Great plugin!! Finding this type of plugin from many times but cannot find it any of the other platform but now it’s just creating problem when i am using it in variable page it’s just reload the current page not going to checkout page when i click on it more than one time then it working..
Please check!! I am using shortcode for variable product because without it it’s not showing….
Here is the link of the product in which i am using it
https://www.mangrooves.com/product/iphone-6-6g-and-6s-360-degree-protected-case-and-covergold/

My mail id is [email protected]

Please do something as quickly as possible……..Because this is a live site……….

Thank you
Tarun