Outdoor camera

Why is it when I get a notification on the app about one of the outdoor cameras has motion and when I go to the time line to check as soon as I get out of the app I get a notification from that camera. Doesn't matter which one if I go and look it triggers it again and all I'm doing is looking at the time line and not going to the camera for a live view. I'm guessing it sometriggers the camera but wanted to see if anyone else has had this happen.