VIVE two hands stuck together?

My project is base on 4.15 and i transfer it to 4.19.

In blueprint I use default VR motioncontroller pawn,in 4.15 everything is OK, but in 4.19, in VR mode, left hand and right hand stay together all the time.

Anyone please help me where is the problem?

Can you take a screenshot of your character blueprint please?

all blueprint just like the UE4 defalut VR project , amost nothing changed.