IIRC, Skuzzy once said something about maps being clustered (4 or 5 in a group, one or two big ones, the rest small) and every Wednesday on reset, hed change the Group of maps thats available for the next week. That way, each week, no matter how many resets, youll only get maps out of the assigned cluster.
I guess the last two or three weeks Donut just wasnt scheduled.