Vehicle triggers alarm.

[Totti1001]

Today was the second time that the car triggered the alarm and I don't know why. Today, I opened the vehicle using the button on the passenger door and then opened the rear door. I closed the door completely and locked it again using the button. Five seconds later, it triggered the alarm.
I immediately received a notification via the app, email and text message: abnormal invasion.
But all the doors were properly locked. So why did the alarm go off?

 

[adeace]

sounds similar to my tucson Ultimate TDI I had before my MG HS PHEV - just randomly went off every once in a while, usually within 5 mins of locking - really intemittent - never got to source of issue on the tucson but just accepted it as that.