Not a real Bug - just a matter of things are working at the moment... maybe it will be changed in future....
Bug.Probably you and the other guy joined at the same or near same time and the game allocated the pit spot to 2 cars simultaniously.
Yeah i see my car overlapped with other cars all the time in MP races in the pits. Not a big deal but definitely feels sloppy...kinda breaks the immersion before a good race.