When I put doors down which link 1 place to the next, they all open and I am teleported to the correct destination. But when I go back there again, the door is open and i can see that gray void thing. are there spacific doors that stay closed or did I do something wrong?

I've seen that before. I even think a door in Mama Dolce's has that problem. Sometimes, if you activate a door in game before you make it a teleport door, its openstate will be set to open so when you make it a teleport door, then go back in the game, it will show as open. You may have also set it to be "open by default".

aah. Ok thankyou