This looks a *lot* like a reflection in the fence to me.
Imagine that piece of fence where the main "ghost" is seen is actually, for whatever reason, reflective. From the location of the camera taking the photo, imagine tracing the light back to that piece of fence. The light would reflect off the fence and into the camera from ... where?
Why would a chain-link fence be reflective? It doesn't make a lot of sense. But look at the photo. That chain-link fence section where our "ghosts" appear is not at all clear. You can't see the chain links properly, even in the magnified images. Now, who is to say that there isn't a clear sheet of hard plastic, or similar, covering the rear side of that fence panel? If there was, that could produce the reflection. But there's no way to tell for sure merely from the image.