Often the easiest answer is placement. If the sensor can see the door crack or any hanging fabric it will eventually catch a little temperature ripple. Mount the bars farther back on the side walls and tilt them so the sensor points at a solid surface or the floor.
A thin door sweep or stick on weatherstrip around the strike side helps too. I actually added two small felt bumpers on the door stop so it closes tighter. No more ghost activations and I did not have to return anything.
