Flickering on 2nd and 4th row of display

Hello guys,

I am trying to setup my display to start working but I have a problem with the Demo too

sudo ./demo -D0 --led-no-hardware-pulse --led-rows=32 --led-cols=64 --led-parallel=2 --led-chain=8 --led-slowdown-gpio=5 --led-pixel-mapper=U-mapper --led-brightness=80 --led-multiplexing=1

I am using 64x32 Led panels U-Mapper with 2 Chains (8 panels per chain)

Chain#1 =
1 > 2 > 3 > 4
8 < 7 < 6 < 5

Chain#2 =
9 > 10 > 11 > 12
16 < 15 < 14 < 13

I got the image and its fine just what I have is flickering also jumper wiring didn’t help me, nothing changed.

the black lines in the middle are made from my camera the square is full but I have flickering on the right and left ends

sudo ./demo -D9 --led-no-hardware-pulse --led-rows=32 --led-cols=64 --led-parallel=2 --led-chain=8 --led-slowdown-gpio=5 --led-pixel-mapper=U-mapper --led-brightness=80 --led-multiplexing=1

Also Volume bars Demo test is so bad