My question has nothing to do with self-leveling.
With motors spinning, any arm that you push downwards should speed up. That is the most basic point of a flight controller's existence and has to do with stabilization, not leveling.
So, if you force it to roll left, the left arm should speed up. Force it to roll right and the right arm should speed up.
Pitch it forward and the front motors should speed up.
Pitch it backward and the tail motor should speed up.
Are these things happening or not?