Run a comparator superclock(how to build it: Place a comparator, switch to subtraction mode where the light at the front turns on. Place a block in front of it, with 2 RS dust at the side of the block and the comparator. Place 3 RS dust in front of the RS dust, then place the piston with RS block in front.) Power the clock. You will see that the RS block will move back and forward very quickly. Place a piston in the position where the RS block will go to when the piston extends(a.k.a. RS block extended position)when the RS block is retracting/retracted. The piston will sometimes push the RS block and the piston one block farther, then the piston extends at the extended position as the RS block is powering it. This may occur as pistons respond lately as it takes 3 ticks for pistons to extend, but I do not know the main reason though.(Also affects in 0.16.0)