Why was bird-chirping sound turned on middle of night

Just now 6am my son was crying and when we went soothing him noticed the bird sound was turned on. Checked video history realized it was turned on since 4:12am and worst part not by any of us in the house!

Recently at times (once yesterday morning) I was not about to turn off nature sounds opened by my husband from my phone while my husband’s seem to be fine.