Why Is My Accuracy Suddenly Negative?

Did a Forum search couldnt find anything but Ive seen alot of this lately. I had 19... something accuracy the other day, and after a game of Domination on Discovery, it all the sudden is Negative and rapidly decreasing. Pretty annoying now since i constently get accussed of being some sort of "Hacker" now. Anybody have any answers for me?

Thanks