Ring motion alerts keep turning on by default

Hi I have just installed my first ring (doorbell 4) and it’s working fine apart from motion alerts keep defaulting to on. I don’t want motion alerts as I have cctv with motion alerts so preserving battery life on the ring is my priority. However, every time I go into the ring app, devices, and toggle off motion detection, within a day or two I get a notification on my app saying motion is detected and the toggle has defaulted itself to motion detected on. Is this a bug because it’s really annoying and it seems like ring are pushing to have motion alerts on no matter what setting you choose. Is there a setting I’m missing somewhere?