Thanks for the welcome! Yes, I am referring to the totals on the Zooniverse Projects site. I have just logged in and my Moon Zoo tally is 290. Yesterday (20th Oct 2014) it was at 102, down from about 169. I logged in at another time later on October 20th and this number had then gone down to 29. At this time, I had submitted around two-hundred classifications. It may be just me, but participating in five Zooniverse projects (particularly the PlanetHunters) I have not observed such a fluctuation anywhere else.
Perhaps it takes a while for the number to stabilise as my present number 290 seems about right (logging in at the time of this post). As you write, it may be something to keep an eye on.