iPhone played Find My lost alert by itself

Hello,

Today an alert about a lost iPhone from FindMy was played on my iPhone. But the thing is that nobody turned this alert on. My phone wasn't lost or stolen. I also hadn’t set any reminders or alarms and my phone was on silent mode. It looks like my iPhone just played this alert itself, which looks really strange to me. I don’t understand why it happened and how can I prevent this happening again in the future.