We found a glitch in product specific coupon codes.

I had two products in the cart and used the product specific coupon code and it took off the amount for the one product which is correct. 

However, if I then click to the next screen where you confirm your address and info and then click back I can then remove the product from the cart that the coupon applied to but the coupon discount remains and is applied then to the other product.

Please advise