Also strange. I now show as Gold too. Nights are correct at 28. I have 9 more nights booked for the 10th-19th and am registered for the megabonus 2012 promo. But never signed up for challenge or anything to get gold faster. Not complaining as I like it if it is true.
Looks like Marriott put me in for taste of gold promo. To keep need 6 stays by end of year. Usually don't do too many stays but do 9 night stays so lots of nights. Already Diamond with Hilton for next year so maybe I'll concentrate on Marriott rest of this year and maybe get Platinum.