Hi @cvdbfgnhmjfds,
Thanks for getting back. It seems that your display is a bit different on that order screen. Just to check, from the Plugins → All plugins page, which WooCommerce version do you have?
You’d mentioned:
..the difference between the old and new price is shown as a coupon.
Is it possible to share with us a longer screenshot that includes this coupon part? I ask because when I reduce the total price of an item in an order, the new price is shown. Further, the old price is no longer shown. Thus, I’m thinking you might have added a coupon to your order.
Thanks.