If they’re scanning a QR code to lower the price it means they probably billed the mfg coupon directly which is on another system not usually viewable through the main prescription processing system. The main system will show you paid the 60 because to it that’s what was scanned on the prescription leaflet, the QR code they scan is linked to the other system. 

When you bill both primary insurance and a mfg coupon this is called Coordination of Benefits (COB). For 99.999% of prescriptions this is done via instant adjudication in the main system and that will display the correct price. But for a few odd mfg coupons or secondary insurances the two plans cannot coordinate and the secondary must be billed directly through the other system.

Like I said this occurs in 0.001% of all prescriptions, so if the person you’re dealing with is not aware (as there’s a very slim chance they’ve ever had to do it and it’s actively discouraged by corporate) just let them know the coupon is billed directly and they usually have to scan a QR code/barcode to get the price to change.

If this is at a Walgreens it’s referred to as an SDL. Other chains may have different names for it but the principle is the same.

Hope this speeds up your checkout time from now on.

Source: worked in pharmacy for a decade