Hello. the hopper ticking (item transfer rate) is extremely high.
such high rate that comparators sometimes cannot follow it and toggle
and if they toggle it burns out redstone torches and lamps.

after placing the hopper 12 times i got 1 set working but if there is a server restart or i place them again its trouble all over again.
i imported the main world from vanilla but it also happens on other worlds generated by spigot itself (with multiverse)