Other voices on the camera

This has been asked before but they were all closed topics, so I figured I’d bring it back up, so I can get a better understanding. At first after reading other people’s comments, I thought yeah maybe its picking up someone’s voice outside but after midnight though, and it’s not muffled. I can hear the words just fine, so not sure if these cameras can pick up conversations like a baby monitor sometimes does, that I’ve seen before but this is my first time with the cameras. I do have water running in the background and I do admit that’s what I thought it was at first but then it got clearer, like I know what words are being said, so it’s not the running water in the background. Just curious.