Alarm.com will show them in an activated status for an extended period after activity. This is normal. See the support thread below for info on how this works:
Sensor Activity Monitoring (SAM) for motion sensors and Image Sensors enables the sensor to report if it has recently detected motion (status shows as Activated ) or if it has not detected motion recently (status shows as Idle ).
Each time a motion sensor or image sensor detects motion, Alarm.com updates that sensor’s status to Activated. To avoid excessive Activated and Idle status updates in the event history, Alarm.com waits until the motion sensor or Image Sensor has been idle for 1 hour b…