I think that this happens because when a player's highest main skill changes, the group of players he is compared against can change. If a player is compared against a whole new group of players, then his estimate will reflect the new group of players. Their value can easily be much higher or lower than the previous comparison group, especially if a small sample of comparison players is involved.
Last edited by The Mogul at 8/4/2009 5:50:14 PM