Bug with pistons and repeaters

When I use pistons to shorten a redstone pulse, It won't work as expected when the redstone signal comes from a repeater. The attachment explains it better than I can do.

 

Please note that this is not a comparasion with java, but actually inconsistent behavior

 

However, this can be worked around by using a sticky piston with a redstone block instead of a repeater in front of the circuit