I have been monitoring my statistics since August 2013 and noted some interesting behavior. Twice since August I've noted all my numbers declined or increased as expected with one exception. The user ranking of 5+ projects reversed itself. Although in both cases my daily work unit numbers actually increased during the same period, I lost ground overall. I can see being overtaken, people not accessing/updating very often, and similar issues while my ranking lowered for 18 days straight. I find it difficult to believe that many people suddenly added themselves and attendant work units. There has to be some other reason but I'm not familiar enough with this system. Can anyone explain why my ranking numbers reverse themselves every so often?