Piston Glitch

What I expected to happen was the (sticky) piston, when activated, push/pull normally.

What actually happened was the (sticky) piston, when activated, give me a graphycal glitch, like flickering.

Steps to Reproduce the glitch:
1. Put a piston faced to anywhere;
2. Switch on the piston with any type of redstone power (i prefere the lever, to do the next step);
3. Try to switch on and off, the lever, very quickly very fast, and then you see the flickering glitch.

It could be of my low computer, but i was running the Minecraft in a void world, witch means high performance (max:55fps for my computer, at least).