You got cowgirl unlocked? As in the skill? You can use the skill in combat?
Did you use the "Migrate" button in the settings menu? I think that may cause issues and it's the only thing that would set prisoner limit to 3. It'll be removed in next version. You could try using the new html I uploaded on the OP, but can't be sure it'll fix things on your save.
As mentioned, I'm not the one who coded this prisoner rework, or made the migrate option, so having a bit of trouble figuring out exactly what is going wrong for people. Appreciate any information you can give me