[Client?] Possibly a visual bug?

I transfered over to NA from LAN because of the server transfer. When I logged on to the NA server I got a mystery skin for good behavior. In the mystery skin was "Nunu bot" while that skin is great and all I already owned the skin. I bought nunu bot on LAN not too shy of a month ago. Could I get some light on this? Will I be stuck with 2 Nunu bots? Is it a visual bug?

Proof: http://imgur.com/a/XuSXW

Any thoughts? Thanks, xJConx