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:

1. Place 1 redstone dust.
2. Place a redstone block on top of it.
3. Put a 5x5 square of redstone dust 
4. On the 2nd row in, put a repeater. 
5. All the redstone will light up...
6. Destroy the redstone block...

Expected result:

The redstone repeater and dust will stay lit up.