Yes this is a hubpages 'mystery' as far as I'm concerned. The 'rules' in their section about scores have always been cloudy to me. I have no clue even though it is supposed to be related to quality and other factors. Good question and many people always try to tell me the answers, but they make no sense. I've gotten as far as 98 but then drop four or more points like a rock. Kind of like a carrot on a stick I'll never really get.