Max Skill level?

Is there one? I’m currently at 9 levels of unarmed combat and it doesn’t seem to be going up at all. Melee still is, which is at five. I thought Zui Quan would have been messing up the progression but all turning it off does is turn the red unarmed skill to blue.

I generally play with all skill rust turned off, and ive seen things still going up with skills in the teens.