Rail Duplication

Video Proof: http://youtu.be/HKlbACKFH0Q

Steps to reproduce:
1] Setup pistons, rails, repeater clock and glass as seen in the video
2] Power the clock with a 1-tick pulse
3] Place Powered, Detector or Activator rails infront of the piston over the glass block
4] Rails should start duplicating.

NOTES: As with my other duplication issue I have set this to PRIVATE as duplication glitches ruin server economies.