Powered Pistons

for some reason, pistons sometimes power other pistons...

reproduction steps:

1. place 2 piston facing left
2. place 2 pistons in front facing up
3. place repeaters facing pistons
4. place Redstone behind the repeaters
5.  place something to activate it (lever preferred)

at least one of the pistons from step 2 should get powered, if not you probably need to redo the steps