I agree with you that I opened it up, but I was just supposed to pay it and not ask what the difference was in the dinner charge?? And the waiter said he was new. He had been there three weeks.
You have to do what you are comfortable with. As I stated, if anything is added, I consider it all to be the service charge. I have encountered the tax and split of anything added to a bill as well. That is between the business owner and the server and not really my concern. Perhaps since he was new, he was misinformed or took it upon himself to try to explain the bill. Lee's seems to have a pretty decent computer system and order entry so I would think adding anything would not be easy. Tough call for sure.
Enjoy the rest of your stay.