Spotlight cam.. not always detecting motion and people reliably

Have a new spotlight cam. Setup zone areas on driveway. Sometimes it detects motion and people and other times it doesn't. For example today, the FedEx driver truck detected motion (outside my zone btw) and the driver walked across my driveway in middle of a zone. No person trigger. Later I moved 3 large trashcan across same camera view, no motion even triggered. Yet a person walking their dog on other side of street not in my zone triggers motion. What gives? I have checked settings multiple times. I am a veteran ring doorbell user so the software is pretty familiar to me. But this new cam isn't working quite right.. Ideas? I must be missing something. Its mounted at about 8ft up. And my driveway isn't terribly large. I created 3 zones and drew lines around my car, and left and right of car to frame my driveway and front yard. Can post pictures if it helps.