I was trying to make a small flip flop system with pistons, I tried to do it with the repeater in the coordinate of Negative X and Positive X and it worked but it didn't work in Negative Z and Positive Z. I tried the same system with redstone powder, it didn't work in any direction.
The client, launcher, the server you are playing with is modified.
Issues with mods or plugins need to be taken up with their authors. If you can reproduce this issue in a vanilla environment, please let us know and we will reopen this ticket.