As you see here, this .png file has an audio property (There is no audio checkbox). Deleting the Audio property removes the whole file from the comp. When I import this into my comp, it also automatically shows these two - However, if I import into another comp, everything is normal. It doesn't seem to affect anything, but it's quite annoying.
Yeah, but I don't see the little speaker icon that indicates the presence of an audio track. It's probably just some of the seemingly-random weirdness that is AE CC2015.x