Nope, rested at a caravan and nothing changed.
Savegame if anyone wants to try:
I also tried again and well no level up even with 9999999 exp points 😀
[Edited by Supersize, 3/7/2018 12:18:24 AM]
Maybe a stupid question but do you have the Nixperience Band equipped on any of the boys?
Not that I noticed I will have a look again now.
I ended up just maxing out the level (120) before leaving the first area right before the car is fixed.
I'm not sure what I did because I stopped leveling up when I got to the hotel, this was after buying new equipment, stocks and customizing the car.
One thing is you don't get enough AP to max out everything.