@Closy-Market Sorry I can't help you further, I don't know how to code. I just followed the instructions here like everyone else and combed through all the threads until I found a solution that worked for me.
I am using Venture theme. This functionality is working perfectly fine on all the pages except product pages. As soon as someone adds a product to cart from product page, double of whats exactly has been ordered gets added to the cart. I believe my default add to cart function on product page is working in tandem with the new one. Any solutions to this?