HubScore and HubberScore fluctuate constantly. You need not worry as this is a result of the algorithm that is used to determine your scores, taking into account several different variables. Follow this link to get more info: http://hubpages.com/faq/#hubscorecalc
My scores change almost daily. It's not something to worry about; just keep writing high quality content and stay active on the site and it should rise! I hope this helps!