This glitch happens When You Follow This.

1- Put A piston In the air ... JUST Like The Picture (1).
2- Place a Block on The Piston with 1 block range ( AIR ) ... Like Picture (2).
3- Place Lever On the block and Turn it on .. Just like Picture (3).
4- Place A Block Next To The piston AND IT will Work .... Like Picture (4).
5- Break The block That Next To The Piston Then Turn Off The Lever .... Like Picture (5).

6- Break The Block And The Lever AND we Have A floating Powerd Pistion ....Like Picture (6).