I don't understand the save file mechanics of this game

So here's the thing... I beat Fajar at age 21 (he sent me into retirement on my first run that's why i replayed that level over and over again)... I moved onto Sean and beat him at 72... Off course I wasn't happy so I replayed it again and again and beat him at 26... So now I should be able to start Museum at 26. I closed the game and reopened it, guess what? It shows I am at age 72 and some skills which i permanently unlocked in my repeated runs at the Club were gone too. This isn't the first time this happened btw, I just got frustated cause it happened again. Can someone please tell me what am I doing wrong? I love this game even though the bosses are hard af that's where the funs at, but if this save issue keeps happening again and again it makes it really annoying.