Doorbell deleted/ over written an event without my interaction

  1. Had Eufy doorbell with home base installed for 5 days now.
  2. Yesterday I had a guest for a short notice.
  3. The guest went in using the main door. Where I’ve got notification as normal.
  4. The guest left from the same door. Didn’t receive notification for that.
  5. Tried to view the notification received for when the guest came in and I got message says. No video available the video is either been over written or deleted.

Any explanation?