Vegas, that has happened to me many times. I would order a cheeseburger without the meat, and consistently would be asked "so you just want a hamburger bun?" No, I want a cheese sandwich. And time after time they would often goof up my order.
the last time I went to BK I walked in. Ordered my usual cheeseburger with no meat and answered their very bewildered questions. The finally got it right on the third try, and I haven't been back since.
thank goodness for INO when I need a grilled cheese.