Popup not showing in variation products

The popup for simple product is loading and working fine but total is not showing its not a big issue but the thing is the popup is not at all working for variation products. Instead it is taking theme or other plugin ajax to show some other notification. I just want to override the inbuilt ajax and want this plugin ajax to show popup for all variation products. Links for simple product and variation products are below:
Simple product: https://edp-dental.com/product/heine-beta-belt-clip-x-00-99-008-2/
Variation product : https://edp-dental.com/product/aquasil-soft-putty-std-pack/

The page I need help with: [log in to see the link]