Ihave version 1.2.13 of your Gre en Mart theme. Unfortunately, in the Google data layer, the quantities are not being counted correctly when adding products to the cart, and the ‘add to cart’ event is not triggering in the mini cart when changing the quantity of a product. The same issue occurs in the order summary. Will updating to the latest version resolve this problem? If not, will there be any issue with a refund for the purchase of the new version?
Sounds like compatibility issue. Have you tried to contact the item author for support?