Bug Piston

Pistons and sticky pistons extend when there is redstone in two blocks over these :

/A/_____________/A/
/A//B//B//B//B//B//L//A/
/A//A//A//A//A//A//A//A/
/A//P//A//A//A//A//A//A/
/A//A//A//A//A//A//A//A/

/B/ Bloc
/A/ Air
/P/ Piston
/L/ Lever
_ Redstone

Sorry if I'm not very clear, I want not use Google Translate.
And I don't know where there is the blog where are every bug