To me 6 people for automatic gratuity is a really low number. Since the automatic gratuity was included in the total price of the bill in the transaction, maybe the servers get screwed by the owner on the bills with automatic gratuity. There was a restaurant that a group of us had gone to a few times and one time we had extra drinks on the bill. When it was brought to the server’s attention, she looked pissed off at first and then nicely corrected the bill. We later found out from someone that used to go there regularly(the place went out of business) that the owner would pick groups that were drinking and would double the number of random drinks on the bill without the wait staff knowing. Owner seemed nice but obviously he was an a-hole. At least your credit card number wasn’t stolen.