Ring 2 updated version trouble detecting motion

I purchased a ring door bell had it for around four days. Then noticed some scratches, i had a replacement sent out. Since ive set it up its not detecting people walk in the garden and the person just suddenly appears at the door. It used to detect motion when someone opened the gate and start recording now its only recording after persons rang the bell doesnt show then leaving or entering. Before i had it on standard mode and was perfect but since replacement has been sent its not working . Can anyone help?