Motion detection

I have the regular $99 ring doorbell (chargeable). The wi-fi is fine. I’ve had to move it numerous times. I’ve moved it from the door, which wouldn’t pick up anything. Moved it to my shed, which was too high. I now have it about 2-3 feet from the ground. It is constantly going off, when nothing is happening. I can also walk by it and I do not get notified. I have the Pro at my front door which works perfectly.