The classic lawn rake falls over just a little and blocks the view of the optic sensors, (which you already basically said, bc.)
Be careful adjusting the close force adjustment screw. It should only be forceful enough to close the door with a solid contact for the door seal, but not so much that it could crush a small child or family pet. In other words, a 2-liter pop bottle shouldn't be killed under the door.
My guess based on your description is the electric eye is out of alignment. Good call, bc!