So I was looking at some redstone and realised that I was getting a bit of an issue with pistons.

Placing a block with a torch two blocks above a piston then running a signal from it causes the piston to update without power and extends. Breaking the redstone doesn't rectify the issue and you have to break blocks by the piston for it to retract.

That sounds confusing I know, but please look at the video I have attached.

https://www.youtube.com/watch?v=DBCZ30X1tOk