That's an interesting trend. Which groups?
Member Counter

I noticed it these three but probably more out there
http://www.chess.com/groups/home/queens-gambit-players3
http://www.chess.com/groups/home/total-random-team-admins-exclusive-group
http://www.chess.com/groups/home/gambit-ears
I noticed that the member count feature rounds up to the nearest nine in some small groups. Any idea why? Not that its a problem, but I just find it kind of interesting.