[BUG] MTG deck classification error

Please take a look at this deck:  http://deckbox.org/sets/288786.

The system flags it as "Extended".  From what I can see every card is Standard except for Whispersilk Cloak.  Whispersilk Cloak's last printing was in M11, so it should be Modern, not extended.

Can anyone else confirm that I'm seeing things correctly, or did I miss something?