What I expected to happen was...:
normally just a quick clock

What actually happened was...:
a clock of the time for a piston to move wich make sticky piston with a redstone block bug

Steps to Reproduce:

1. take a sticky piston
2. put an observer block with his face on the sticky piston
3. put any solid block on top of the observer block
4. put an observer block facing the sky by using the other observer block
5. power the piston
6. u can break the second observer block
7. put a redstone block in front of the sticky piston
8. put all possible piston which could be activated by the redstone block 
9. u get tp 'in' the pistons which move quickly by approaching them