What is happening with this player?

https://www.virtualmanager.com/players/13706325-qochaq-qasimov/training
Started training well, first 12 trai igs were really high then he started training mostly bad. How is this possible I don't understand! It's making me crazy...

Looks fairly standard pattern of training. Peaks and troughs

Training is affected by morale but also if you don't change the exercise then over time average goes down