XT2 unreliable motion detection

Added a XT2 outdoor and it is mounted just above the front door, and angled down a bit and towards the driveway. I have a clear clip/pic view of the walkway and driveway. I can NOT pick up any motion in the driveway area, yet a car coming from further out on the street will activate and alert. I’ve walked up/down the driveway. Moved a Car, Motorcycle and Truck up/down driveway and NO alerts at all. (again though much further out on street it will pick-up passing cars. Or on a close bush to the front door movement will alert. Is this possible a bad unit? (My indoor home units with the same distance to my driveway easily pick up movement)