Why is this picture STILL in my Gallery?

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http://forums.androidcentral.com – Ok I've seen a lot of people asking how to delete albums in their photo Gallery, but this one really has me stumped (I already know how to go to Google+ to delete photos so they'll disappear). This was a photo I posted to Facebook. I think I posted it via the Facebook app, but it was a while ago and maybe it was through website.... The photo appears in my gallery as it's own album entitled "Posts - [my Google username]" I have attempted to delete every known existence of this photo. Deleted the photo from phone Deleted the post of the photo from Facebook Deleted the cop (HowTos)