First welcome to the forums if I haven't welcomed you already.

Second, it doesn't say where you hail from so the animals might be different where you live compared to PA but I'd say it's likely your hearing a contact call. Deer are very vocal animals and especially between does and their offspring. It could very well be likely your hearing a family unit.

I can't immediately think of an animal that would mimic a whitetail contact call but like I said, you may have species that we don't have in PA......

Very good question tho. I do know when it comes to turkeys, everything in the woods sound like them when your straining to hear them...LOL