Haunted FM? Being moved to Entrance from rooms

I was chatting in room 4, ch7... and I went to check something on Firefox (I use minimized MS if that helps). I came back and I was in FM Entrance, without having actually moved there. I came back, same thing happened. Switched rooms... same thing.

I think I remember hearing something about a similar problem with the FM from someone else. Can anyone shed some light on this?