There have been questions regarding why a Zone still shows open or active when logged into Alarm.com even though you just left got a green ready and were able to arm system.

Here is example:

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It seems like this is an error but here is why the system does not always update even though system is armed and all sensors are alarmed

Motion Detectors or PIR's that are set for sensor activity monitoring on Alarm.com are only updated with a new status from the same sensor or after about one hour. Door/windows report therir status in approx 3 minute intervals. This keeps the the signaling over the cellular network from being overwhelming due to motions constantly activating from everyday activity.

Once the System is Armed the sensors signals are immediate and will signal as programmed