Been playing Chateau de Medusa Normal and found a strange (?) thing in room 18303.

I entered, standing still at the leftmost side of the room, very close to the entrance waiting for the head to come into the big spider's reach. The skull spider killed me [got better at this now :)] and I suddenly found myself in the left part of room 18302?

Is this normal perhaps?

That does happen sometimes, that you get killed off and find yourself back in another room. It's not common, but it does happen.

Yes, basically the game does not want you to come to life on top of a pit of lava or anything, so it will always move you back to your last "safe" position at the entry to a room when you die.  Because you never fully entered room 18303, you were never considered fully safe in the room, so you get moved back.   ;)

And as far as I can recall (which is difficult in my case) it also happens when Jack enters a room, but NOT on a solid floor. E.g. silver or gold blocks, platforms, ...