Why this false alarm?

On Sunday we exited our home as normal. We exited well within the delay time for arming. At 5:53 the kitchen door triggered an alarm as we were in our driveway. As did the motion sensor in family room.

I am wondering if you can provide insight?

Taking a look at the history, the Kitchen Door to Garage did not report closed before the exit delay ended. This triggered the alarm, and the motion detector was tripped just seconds before the system was disarmed.

I would suggest checking the gap distance between that door sensor and its magnet, and replace the batteries if they are old.