Q: Photostream

I took four photos with my Iphone 6 on a beach through the knothole of a driftwood log. On my Iphone and on my IPad mini, those four photos are in black and white, so I was just assuming I hit the B&W filter before I shot them.

However, when I got home and looked at my old Ipad 2, there is one missing in the photo stream and the other three are in color.

Can anyone explain?

What is REALLLY interesting, is the shot that is missing from my Ipad is the shot that I took which photographed, through the knothole, a person walking by on the otherwise deserted three mile beach.