Which is...perplexing... I think I remember reading somewhere that the scores are also adjusted in comparison to what else was written at the time? Is this what has happened here Lazeez? If that's the case, when in the month are all the rubbish stories written.... ;)
At the moment, many of the stories being uploaded are the 'classic' sci-fi novels whose copyright has expired, though the competition might be a bit unfair for the typical amateur author. Also, as noted earlier in the thread, your story adjustment only kicks in after a certain number of votes, so you'll have a high score, and suddenly it'll drop sharply, not because of anything in the story, or any negative votes by readers, but simply because you crossed that magical threshold. Those are all the dilemmas of posting to a site without many readers yet.