Whenever I take advantage of a store instant savings promo- I always have the clerk total my order before handing over coupons. This allows me to be sure that all the discounts I should get come off.
Once the cashier hits total if the discounts or instant savings didn’t come off we can rectify the situation before my coupons muddle up the totals. It only takes them a second to hit total and watch the total drop.
This is also helpful with Harris Teeter EVIC (Zvar) coupons= when the order is totaled it allows you to see all the discounts come off.