Why does my Subaru Outback need a smog two years in a row?

The smog check you obtained during the purchase of this Subaru did not reset the years (odd or even) in which the registration renewal will require a smog check. It appears this vehicle may have been getting smog checks yearly for the past three years; once in 2010 during it's regular smog check requirement cycle, then in 2011 when you bought it, and now again in 2012 (back in cycle).