If you click the little ? on your dsr area and then follow it to more info, it says 10 feedback (seller) in the last rolling 12 month period. Looking at your feedback, you just got what should qualify as your 10th today (the one one 4-3-11 is just past 12 months) i'd say give it a day or 2 and check again, it may not update right away.
I have a dsr but all mine were sold over the last 5 or so months so I don't think it's 10 in one month.