Idk, some weird editing mistake combined with a hint of retardation probably. I mean, it's not completely wrong, you have a duplicate Group 16 instead of Groups 1 & 2, which are missing, and a copy of Group 3 replacing Groups 17 & 18, which are again missing, plus some duplicate lanthanoids and actinoids. Still pretty dumb.who makes a wrong periodical chart as an asset? just why?