Not saying this isn’t real and completely scummy, but sometimes the tip is calculated before discounts, gift cards, and whatnot. I always tip based on what our total order was even if what we paid was less. If this is truly trying to fudge the numbers to take advantage of people then that’s shitty.
It looks like the percentages are based of a total of $37.95, so it’s possible there was a discount included that made their total closer to $30.