Solved
[BY DESIGN] My sims's skills reset after birthday
I aged two of my sims with cake to teens. Now when I loaded game, their skills reseted. They both had like 4 different skills at lvl 4, but now there is nothing. There is only text the sims don't have any skills. I also aged my one sim to young adult at the same time, but he still have all his skills.
Child skills are different. They don't transfer. Maxing out should give you an advantage towards teen/adult skills though.
Just unsure if you need to max them all out.
