I was flying my Mavic 2 Pro indoors at a trade show during setup this morning (with the blessing of the organizers, etc). I set RTH to hover, and all the steps shown in this video; I took off from a 2nd floor balcony, though, and kept getting a message that the aircraft had exceeded its maximum height, and it would automatically drop a few inches. No harm done, but it did make me super nervous while flying. I want to understand what's happening, as it made me feel like I don't have full control of the aircraft.