Hello @LinAGKar, are you still experiencing this issue on an up to date system?
The DS3 driver only provides the face buttons as digital buttons nowadays, same with the D-PAD and L1/R1. Only L2/R2 are still analog, and they seem to work fine in big picture.
Nothing extracted yet.
When an axis is mapped to a face button in big picture mode, it will be considered as pressed when it is not 0. However, the analog axes for the face buttons on a PS3 controller are maximally negative when not pressed.