Mod PCB so button can not be held (just tap) or button override (no two inputs held at once)

Hi all,

Playing Mortal Komba XL (MKX or MKXL).
When I press UP, and then without releasing UP i press DOWN - it will not register. It works other way around.
So if I hold DOWN and press UP. UP will overwrite DOWN and character will jump.

I noticed it different per pcb (gamepads). Tested about 5 different gamepads. Sometimes left overwrited right, and sometimes right overwrites left. Like, if you hold left, and then tap right, right will not register (nothing inputs). But other way around it takes priority. And vice-versa.
Gamepad I have Genius Maxfire Blaze 3, all arrow keys neutralize.
But in MKX up still overwrites down. Left and right will neutralize.

Some characters have moves like jump (up), down+side+button.
This then gets trickly as I tend to still not releasing UP fast enough. And I need to release it before I can input DOWN (or else it will not input due to arrow UP being higher priority).
I tried to map commands to other keys, and then I tend to get override with left/right. So it seems like its type of gamepad you use with MKX.

So I am wondering if I can make it so there is no hold on certain buttons (hold results as tap) or changing priority of buttons. So if I press DOWN while holding UP, DOWN will input.

Thanks!

I tested