Sticky Pistons not pulling blocks back

I made a redstone contraption and then I tried to rebuild another one side by side (no direction change) and then the bug showed up.

The bug is shown in the beginning of this video (from 00:15 on): http://www.youtube.com/watch?v=qqQkxkr0Pd0

Also a map download is available in the video description in case you want to test it.