Sorry Baloo, I'm trying to see where I made a mistake. Unless you already fixed it... The only ways that the 5th  floor is attached to are other ways tagged as layer=5 and then to way w592497075 which is layer=4 but is labeled as an incline (that connects to the 5th floor at the end). Don't we want the 4th floor to be connected to the 5th floor at that point?  