Pistons Pull Players When Retracting

I was working on a piston elevator when I kept encountering an annoying bug. Sometimes, when I set a redstone delay for too long and a piston is pushing a player in creative where it is impossible for the player to go, then when the piston retracts, it pulls the player behind the piston.

What I expected to happen...:"
The player remains in the same spot when the piston retracts.

*What actually happened...:"
The player is pulled behind the piston when it retracts.

Steps to Replicate:

1. Set up the piston so that if it pushes the player, the player will not move. (See 2016-03-11_10.15.35.png)

1. Power the piston. The player should now be inside the arm of the piston. (See 2016-03-11_10.15.45.png)

1. Wait for the piston to retract. Once it does, the player should now be behind the piston. (See 2016-03-11_10.15.54.png)