Led flickering on extended board

I just connected my konnected syst in parallèle with my actual  DSC alarm system.

On my DSC panel there are no resistor. So my problem is on some of the imput I can not get the amber led to turn off completely and some are like flickering event if I fully turn the potentiomieter.

That cause the  board to transmit false signals to the hubitat.

Some one has any ideas what is wrong.