So I haven't played creative for a good amount of time. I get back on and see these items in my chest. What are these? xD http://imgur.com/a/GbLav <----- Images of the items
If I am correct, those are "god items" which are hacked items that were created ages ago. They have been outlawed because they create lag for other players.
Those are what we call "god items'. Players who use 1.12 are able to save their inventory and transfer items to the server.