jp has explained this "bug" already in one of the Cobacoli levels comments: "...I only save days of highscore (3 bytes intead of 8 bytes for date + time). So if you achieve the same score on the same day, the highscore is random. I'm not yet sure if it is really worth adding those 5 bytes or not..."
I was wrong ! I not could remember how I did the 27 moves. So I came up with the 26 solution, thus giving the possibility to verify the bug on the high score