Dark app icons, weird message appeared in app photo galleries (but not in google photos)

[Android Central Question]

Strange dark app icons (g+, twitter, etc.) have shown up as postable images in my photo gallery on twitter and instagram (maybe elsewhere too), but they don't show up in google photos or device photos. They're accompanied by a plain text image that reads "if you need more icons, please contact me " What's going on? (galaxy note 8)

 

[B. Diddy]

Welcome to Android Central! Did you install any themes or icon packs recently?