Sticky Piston retraction at Y level 1

Sticky pistons will not retract downward at y-level=1. Its an issue for my build because I need retractable lighting.
I've included a video in the google drive link: 
https://drive.google.com/drive/folders/110XI4zT7q1-SJZxOxo6cBh34ymqEskgn?usp=sharing