How exactly does this work? I was adding 2 each of a few different products but when it applies the discount it always seems to do it to the cheapest item. Is that how it’s supposed to work? IE: If I just add 2 Ultra 11 I save 70% on my second bottle. But if I add 2 ultra 11 and 2 ultra hard it is double applying the discount to the ultra hard and leaving ultra 11 at its normal price.