I think to have an hardware issue regarding the right nub, I always used it as mouse click, but it's a week that I use it to play "Pew Pew 2" and after different rotation, it seems to have like something stuck inside... seems like glued and I have to press it with more strenght to move it... I tried to rotate it faster than I can, but seems it's becoming more and more "glued" it got stuck in every direction I put it... (it's like having auto-fire in pew pew 2), anyway the left nub doesn't have problems at all, it always goes to the center, and it's soft to move
EDIT: I have a pandora rebirth