How am I getting chirping sometimes when person on motion sensor

I have a Ring 2nd generation video doorbell Last week it was chirping when it detected motion, so peopl going next door could hear it, even though I had that area in a privacy zone. I played around with the settings on my app, and it stopped, no idea how as I couldn’t even see chirps as an option. Yesterday and today, had people pushing leaflets through the door and it’s chirping again. I have it set up to alert me but I don’t want the chirping. I cannot see how to stop it.