Madde Lv 1
When you switch to the Intro Puzzles (to help a newbie, for example) and then switch back to a Science Puzzle you lose connection to the score servers.
Neither your score on the puzzle page will be updated nor your opponents scores on the in-game scoreboard.
You have to restart the application to get your score credited.
Maybe that's the reason why some people didn't get their correct scores credited.
OS: WinXP Home SP3