A $16 tip, really!!!

So, I'm going through the receipts today to match them with the checkbook. I come upon a receipt for lunch over the weekend at a new place. My receipt and checkbook show one amount but the computer showed another. First call, the bank to find out where to go from this point. Second call, the restaurant to find out what happened. Well it appears that Cody gave a $6 tip but my receipt shows the amount $10 less then the one at the restaurant. He wrote the wrong amount on the original copy. I will be going by there tomorrow to pick up a copy for my records. But, seriously did this person not notice the amount? I guess this is just chalked up to lesson learned.