Ok so i was trying to figure out how do make a redstone lava trap so at one point the redstone dust fizzled out so i incorporated some repeaters. There was a lot of redstone dust involved. So i put a repeater down i pulled the leaver on a block the pistons extended but then they stayed extended and the redstone repeater stayed lit. also the redstone stayed lit
How to reproduce:
Place 1 redstone dust.
Place a redstone block on top of it.
Put a 5x5 square of redstone dust
On the 2nd row in, put a repeater.
All the redstone will light up...
Destroy the redstone block...
Expected result:
The redstone repeater and dust will stay lit up.
You have a repeater, The output of the repeater loops to the input, and the circuit is powered by a redstone block.
You remove the redstone block.
The repeater still outputs power because it is receiving power (from itself)
This is what repeaters do, they repeat a received signal, even if the signal is from itself.