Casa Lupe Market, Bakery, & Taqueria

Today 11/16/18 Casa Lupe printed me a receipt who's figures did not match the total on the bill. The computer calculated the addition incorrectly and overcharged me by $1.59. The product purchased was two lunches, one $11.49 and the other $11.99 but the total before taxes showed $25.07. Gratuity is not automatically added to cost here. The restaurant manager apologized for the mistake and refunded me the $1.59. I worry they are overcharging other unknowing customers.