Piston, Honey block, slime block duplication

While making a secret entrance with red stone that includes pistons, honey and slime blocks i realised that they were duplicating and breaking the contraption.

p.s I've also seen similar reports but none had slime and honey block duplications, just pistons.

p.p.s I have an unedited, higher quality version the the video if needed. had to cut down to make 10mb