Altru will honor the previous price given to a patron, so this is why removing the discount does not immediately update the balance. You can refresh the pricing by following the steps below: 
  1. Open the Reservation
  2. Under Pricing, click Edit pricing structure
  3. Change the pricing from Per ticket to Flat Rate. Click Save. 
  4. Click Edit pricing structure again and change pricing back to Per ticket. Click Save. 
  5. Your balance should now reflect your discount.