I had this happen too! What I've found is the Walmart cashiers are using the saving catcher function on the register.
See, they have different options when cashing out a customer. Cash, credit, debit and saving catcher. They DO NOT have to use the "Saving Catcher" option. That will apply any of your saving catcher $ to your purchase.
So if you have $10 in your savings catcher and purchase $20 worth of groceries and the cashier uses the savings catcher payment option. The system will apply the full $10 from you savings catcher to the amount. Then you will owe the remaining balance. To prove this, if you goto self check out, scan in your "savings catcher" app scan in all your groceries and at the payment options DO NOT use savings catcher, just credit/debit or cash.
The system allows you to do a normal transaction with NO $ being taken from your "savings catcher $" and you can submit your receipt allowing you to build up your "Savings catchers" balance.
See, Walmart IS NOT training their cashiers to ask "if you would like to use your savings catcher balance" they are just doing it regardless if your wanting it used or NOT! Even management has been trained to tell their staff to just apply customers "savings catcher" We whats the point of a Savings catcher if you can never save to use it for or when you want???
Product or Service Mentioned: Walmart Savings Catcher Mobile Application.
Reason of review: Bad quality.