Small Business Outlines disappearing on certain areas of a build

I built an art studio, and I noticed that I can't customize to make the main part of my studio public. So, my customers are not using the main part of the business. The area is seen as a room in game and all the walls are drawn correctly. I just can't set it up to be public in that area. Is this a bug or user error? I have updated MCCC and UI Cheats, but that's it.