I'm actually of the opinion that the game shouldn't track stats at all. If nothing else, it certainly shouldn't track them in player/exhibition matches. A simple general skill rating would suffice- something that can't be treated as a race-to-the-top game.
Every time someone quits after the first game they narrowly win, I know it's because of the meta-game created by the "rush to the most wins". Every "one and done" after a close match, every "if I lose I leaved" every "I'm going to get ahead in wins and leave right then" is part of it. I'd rather it not be there.
I'm assuming, of course, that this was just your stats lost. If you lost unlocks that is definitely serious, because NRS actually charges money for these things and it would be really problematic to have purchasable goods taken away from the players via glitch. It means someone (who is admittedly not the brigtest person in the world)has paid money for an unlock and been robbed of it by the game.