I heard a kids voice through my headset?

This happened literally 30 minutes ago and it really freaked me out I was in a party with my friend and I was playing offline and we where talking all of a sudden there was a little kid saying say something nice in 654321 I didn’t say anything but after nothing happens he also said hello hello and kept saying it so I shut my oculus off and read about it here hopefully someone has an answer. Btw I was playing pavlov hunt mode witch is the offline option but i was in a party with my friend so I was online on oculus but not for Pavlov