You know this has happened to me in Disney, not once but 2 separate trips. We were using the dining plan and had a credit card attached to our accout for. Extras like a cocktail or whatever wasn't included. The waiter at LeCellier added a nice little tip for himself once and on another trip we had it happen at OHana, both times we got it rectified at our resort front desk and for that reason I will not attach a credit card to my account ! So watch those receipts !!
The DDP hasn't included tips for years. Did you leave a cash tip? Did you include a tip for the drinks with a tip for the meal?.

You should have seen his reaction. Without a word, he hustled me and my bags out of the car and sped off. It was as the cold air brought me to my senses that I realized I had tipped him $30 on a $25 fare! 
Might not seem like much but it all adds up. I would be so irritated. The least they can do is mention they will be doing it. It just seems shady that you have to find out that way. 