This is because some scores are non-scored, you can choose score or non-score when you're creating a game. Plus, The scores are depending on opponents' points and number of opponents at same game, for example if a player with none points plays against 7 skilled players and win, he would earn lot of points and on the other hand, if a skilled player win against only one non-scored player, he win at least 2 or 3 points.
More of that, all players which have between 0 and 99 points have a bonus of points*3 ( 16 based points * 3 multiplication bonus = 48 total points for example ), those between 100 and 299 a bonus of double ( 16 * 2 = 32 ) and the others normal points. Admins have balanced the score system to help newbies to grow up ^^