Kindly visit this link: http://stackexchange.com/leagues/5/month/webapps and see this screenshot:
My question is: I have been a User here for only 6 Days, so how did I get a #41 Change in rank for the month? It must be "Not previously Ranked" (as I have in the Week's Rank).
It looks like it's working to me.
According to last month's stats, you earned 42 reputation points in April, putting you at #42 for the month. That would be a month-over-month change of +41. This jives with your reputation graph which shows you earning 42 reputation points on April 30, the first day stats are available.
