Am wrong?

So today my dh and i went to a bar/restaurant. This is a bar that we always go to. We got there before 7pm. we got a new waiter that we have never seeing before. We ordered our food .

I ordered a Burger with a sunny side up egg and tater tots. My dh ordered a chili burger. Our orders were brought up to our table.

My order was wrong they bring a burger with an over cooked eggs and French fries.😖

A waiter comes and asks how's everything ( he is the same waiter that we always get for over 5 yrs!) He apologize for the previous waiter taking the wrong order brings me tater tots and my sunny side egg.

Our usual waiter , he comes with the bill . I assumed the previous waiter shift ended or something because he is Mia 🤣.

He takes 20% off our bills, tad $50. My dh ask me how much on tip? I say $10 he says no $15. He is like they are taking 6$ off because of the mistake give him that back to the waiter. Is not his fault is the other guys fault.

Obviously I got up set because i belive the tip should have been $10 and no more! This kd because they messed up my order. While my eggs and tater tots were being made my husband was eating enjoying his burger while I was sitting staring at him waiting for my meal to be fixed.

I'm wrong for only wanting to tip 10$?