Triangle Trip

I’ve been Marriott Platinum Elite since middle of 2005.  However in 2007 I only had something like 40 nights but they gave me Platinum status for 2008.  I thought it was some kind of fluke.  One needs 75 nights to maintain or become Platinum status with Marriott, possibly the toughest hotel status to gain.  In 2008 I had even less, 28 nights to be exact.  But lo and behold, I received my 2009 Marriott Platinum Membership card in the mail the other day.  Can someone explain this to me?  I’m not complaining though.  I just hope they don’t fix this glitch in their system.