After a player walks up and sits on a seat, they jump off that seat, they can no longer get on any seat again until they have reset their character. The bug happens in studio or any game where players can sit on a seat. This started happening in the past day and happens for both R15 and R6 characters.
Open up any game with seats that are activated by touching them. You can sit once, but after getting off that seat, no seat works until the character is reset. This happens in both Studio and live games.