gamePad button configuration issue(connected through PC/PS3 PCB)

[KC830]

i used ras pi3 and recalbox 4.1 ver
Installed by etcher

2 joysticks are connected through pc/ps3 pcb to rRaspberry Pi

Let's say 'Pad A' is on the left
Pad B is on the right one

Problem is ... when i use only one pad(pad B removed), everything's are fine with configuration
but when i tried to use both pad , has a issue

Pad B(on the right side) is keep taking Pad1 priority

even i tried again and again when it says ' 2pads detected'
if i tried to press a button of Pad A , it shows 'pad2' .....

is there anyone who has the same issue and solved ?
need a help ...