Doorbell 2 not detecting people

I have a ring doorbell 2. It has not been detecting people who enter my yard nor vehicles coming into my driveway. It DOES pickup cars going past my house on a street that is parallel to the front of my house where the doorbell is located. I have zones set to cover the edge of the street, my driveway and my front yard. Tech support was helpful in helping me reset the doorbell and updating the firmware. I was hopeful that would fix it. Last evening I had a teenage enter my front yard and throw an egg at my front door. I looked out the window and saw him running from my front walk which is about 15ft from my doorbell camera. I thought that I would catch him! No such luck. The doorbell caught NOTHING! Glad he did not have a gun. What good is this doorbell if it cannot catch a person in my yard 15 ft from it. Seems after testing it I have to be about 9 ft away for it too start recording. My doorbell is only 2 steps up from ground level. If it picks up cars 30 ft away, buzzing down the street then why can’t it pick up a person running through my yard at 15 ft?