Identity crisis?

Let me start saying any mistaken Roos we had ended up with we have gone to a new home LONG ago like a year ago… Our neighbor just told us a batch of eggs we had given him not too long ago (we usually don’t talk much unless we see each other outside since our fences kinda block each other and I only see him if I’m on my deck) ANYWAY his youngest daughter went to crack an egg open and out popped a chick.. They were sure it was a chick it had lil feet but it was not alive…. Our issue? WE HAVE NO ROOSTERS.. No crowing nothing one of our hens does have roo distinctions but we have seen her lay an egg in fact all of them lay an egg… Our Orpington was broody for weeks it made the rest of the hens mad she kept stealing their eggs too. How did this mysterious baby happen!? No no neighboring chickens or Roos got in their enclosure is locked tight and when they aren’t in it we are out with them so we would’ve seen another bird with them…. Sincerely a chicken mom who may have a chicken with an identity crisis. 😩 Also all chickens are a year old or a year and some months old. Yes we are updating the run and coop pretty soon as it looks like some things need adjusting we know. 🥰