First off I want to start by saying this game is fantastic. It's immersive and interesting and I'm really enjoying it.
I do have a glitch or bug that happens on my phone atleast, when the game gets closed, such as just clearing apps in the background, my brothel completely resets. I thought at first that was the goal but I read further that they can level up. I tested it with two new ones, as soon as I got them, and once I loaded the game they were gone.