I have a few short walls inside a room that I do not want to be room bounding. I have some 5 ft. high concrete walls, set to base finished floor and unconnected 5' high. I also have a curb that I made using a generic 6" wall, set to base finished floor and unconnected 6" high. All these walls have Room Bounding unchecked in the instance properties. However when I place a room object with tag, the 6" curb acts like it's a room boundary, while the 5 ft. high walls do not. What could be the problem here?