User blog:Arcadebomber/Need help!

Hello reader. I am having trouble ingame with one of my NPC housings. I recently started a new world, therefore I have to make Npc houses, but one of them wont allow me to place a Npc in there. When i click it says housing is suitable, but doesnt create the little Npc flag. All of my roomsare the same dimensions. Any suggestions?