[cgkdisc]

Actually, the numbers sort of average out. The online program doesn't combine scores from all of the rounds played on the same course. It calculates unofficial ratings only from the players on that layout that round, and that's if the TD does the course layouts properly. So when multiple rounds get averaged, the ratings for one round will likely go down a few points and those in the other will go up the same number of points. So your experience of seeing them go down is coincidental and not automatically going to happen going from unofficial to official.