Did you check your credit card statement to confirm that you were actually being charged the incorrect price (incl. the service charges and delivery fees)? Is i

Did you check your credit card statement to confirm that you were actually being charged the incorrect price (incl. the service charges and delivery fees)? Is it possible that the client calculates the price shown in the UI itself while the backend calculates it separately to do the actual billing, and there was simply a discrepancy between the calculations until you re-installed the app? Of course if you did check your credit card statement then there is definitely something weird going on.