I think I've found a redstone bug in snapshot 13w03a. However, I'm not sure if it is a bug or intended to do so. If it is intended to do so, I am sorry that I made a useless issue. The pictures I've attached explain enough I think
Edit by Anon Ymus:
The comparators look like they are locking the repeaters although they aren't.
MC-6640 Comparators trying to lock Repeaters even if their output is 0 (graphical)