when a sculk sensor activates another sculk sensor by powering a door, both sensors activate at the same tick, but sometimes for no apparent reason some sensors activated by another sensor will activate a tick later & restarting the game might change some sensors from activating at the same tick to activating a tick later, sculk sensors seem to be unstable. 

How to reproduce:

1. Place 10 redstone dusts in a line
2. Place a door in one end & place sculk sensor "B" next to it
3. Then place sculk sensor "A" in the other end of the line
4. activate sculk sensor A which will activate sensor B by powering the door
    sculk sensor B will activate a tick later, place sculk sensor A before B & then they will activate in the same tick