Pistons don't extend other pistons.

I am a very enthusiastic redstoner, however when I try to make a simple double-piston extender the front one only fires. I have tried this on my tablet, ASUS Zenpad 8. At first I thought it was me being stupid but then I tried 4 different ways of doing it and neither of them worked. This is in version 1.0.8 but the drop down didn't give that option to me.
Many Thanks