Hey Tom,
It has happened again that I lost some points during a recalc. You can see below where the game in red was a win listed as a loss with 0 points.
Sorry, I can't upload the screenshot for some reason. It is for the board Battle for New York, the link is below.
http://www.wargear.net/boards/view/Battle+for+New+York/Ranking%20History
Fixed.