Hello,
From this discussion on our Support Forum, cats are known to often trigger pet-immune motion detectors. Motion Detectors weight limits are a general expectation of size and ignores activity from roughly below the height the animal would be walking. Cats can jump and climb on furniture and other items above this height which causes detector to trigger. You can find more troubleshooting tips for false alarms from motion detectors at this link.
As a temporary solution, you can bypass a sensor when arming your system by clicking the bypass icon when arming.
