I had a simiar issue with my ADT Smartthings setup and overhead door configuration. I found that the ADT sensors were REALLY sensitive to surrounding ferrous metals, and my overhead doors have non ferrous foil backed insulation installed so I came up with a hinge rig to make the sensor act as a tilt sensor. When the door goes up, the body of the sensor tilts away from the magnet and triggers an open state, it doesn’t take much to trigger it.
This setup was something i had gleaned when I was on Iris by Lowes before they shut it down, and jsut carried the idea over to SmartThings.