Made 3 attempts to get a cappuccino on deck 5 of Piazza. First two got canceled, even though I didn’t remember canceling them.
Third attempt was masterminded by @abbydancerwho has more experience with the medallion than I do. The difference was, she caused the app to move to a different screen after the order, whereas I clicked the submit button and let it sit on the same screen. The third order was delivered.
I don’t think it SHOULD have cancelled my first two attempts, but I will be more careful based on this experience.