Video Doorbell unexplainably started listening to outside sounds

Anyone have this happen, why? Someone came to door but didn't push doorbell. They started talking and their voice started coming through our cell phone app. We didn't initiate the audio/sound, the doorbell was not pushed, and the video doorbell sound is turned off in the app. Actually hadn't even pulled the app up yet because we didnt realize anyone was by the door. Don't remember hearing the chime.... thanks