Put the summary of the bug you're having here
when i destroyed a redstone block which powers a stiky piston it will turn off
What actually happened was...:
but they will not turn off
Steps to Reproduce:
1. place a facing up stiky piston
2. place a redstone cube up it
3. power the stiky piston
4. the stiky piston will not turn off
Environment
Windows 10 java 1.8.0_73 32 bit
That is BUD. Its bug but when you understand redstone its super useful. You can check https://www.youtube.com/watch?v=r5Wfzfq9kKs