Hi there! Not sure if this is a (known) bug or not, but: Was in a pub last night, and right after killing the queen my rating-gain was at +0. Then the dropship comes and picks us up. As we get the "+10xp Win Bonus" message, the rating drops by -1. Then, at the "+10xp speed bonus" message, the rating drops one unit again, to a total of a -2 rating for the game. It happened to fast and too unexpectedly for me to make any screenshots, but I can upload the replay if that's of any use.