the number of product in the product page default ofcourse "1", before vm 2.0.20b update.After update that's show "undefined" and shopping cart not working when undefined.If you clicked ( when selected undefined) it says "product added" but when you looked shopping cart you see "shopping cart is empty".
However if you clicked - ( thne number of product) it will "1". When selected "1" it works.Please fix this.