Yeah it’s crazy. No idea what’s going on. My medicals are expired but don’t know if I should do it again as I have no idea if this interview is scheduled in error and if I might get cancellation notice before my scheduled appointment. As I have read in other forum same things have happened and when they go for interview they are send back as they mention interview was scheduled in error. Maybe you should try to do info pass and find the status of your i 485. I am trying to do infopass as well but no luck in getting appointment.