- Place a Blood Carpet
- Place a Ride Start on top of Blood Carpet and reenter room (everything should be fine)
- Remove the Blood Carpet, leave Ride Start
- Place the Blood Carpet back on top of the Ride Start (Ride Start appears to be on top of carpet)
- Reenter the room the Ride Start has moved below the Blood Carpet.
I ran into this when designing a room, when you reenter to look at your work and stuff is under other random stuff. Happens with a lot of other furni pieces.