Installation guide for the VBMD3
1) The motion sensors will only trigger a new motion event if there is a period of no motion since the last event (if there's constant motion it doesn't keep triggering the rules).
2) There must be no motion for at least 4 minutes before the motion sensor will trigger another motion event.
The purpose of the motion sensor is for security to capture if there's a new motion event immediately but then go back to sleep before checking for another event. It won't capture each motion event after the first motion was triggered (until the motion event times out after 4 minutes). The reason for this is to conserve battery so the sensor can last years on the battery charge.