Happened to me as well at a certain hotel owned by a US presidential candidate. Was on the reservation with my father who has the same name and had checked in before me. I come to check in and get my key. When I walked in the room, nobody was there, but there was luggage that didn't look my father's, and a laptop that definitely wasn't his. I walked down to the front desk and it turns out there is another guest with the same name as me and my father and I got a key to that person's room.