Pricing Error: Coupon code and 2+ of the same item

[ryanmagno]

Customer used a 50% off coupon code. She ordered more than 1 of the same item, and the pricing is broken. She was charged way too little (in fact I now owe money back for one of her orders). I've verified this on my phone, and get the same pricing error. Please take a look.

This was using Kite 6.1.2 with Apple Pay, I didn't check the other payment options. See screenshot.

Replicate the case:

1. Add any item to cart
2. Add a coupon code
3. Tap the '+' button to add more than one of the item. Keep adding some more you'll see very strange behavior.
4. Look at the "Pay" button you'll see it's the wrong price.