Ring Indoor Camera Sometimes Does Not Detect Movement or Record

Hi. A couple of nights ago I got in to my apartament to pick up a piece of luggage and left about 2-3 minutes thereafter. My ring camera which is placed facing the door did not record my entrance but recorded muy exit. I did not turn the lights on when I opened the door since I was in a hurry and only went it to retrieve the aforementioned piece of luggage. I would like to know why the camera did not record my entrance and only recorded when I left, as I feel unsafe if the camera is not working properly.