The problem was that Brandy did a horrible job at lip synching. And in the middle of her dance set she stumbled and fell down.
Brandy looked odd and disheveled during the performance and some on social media are suggesting that she may have been drunk on stage.
This isn't the first time that Brandy was emerged in a lip synching scandal. Last month Brandy reportedly canceled a highly anticipated concert at Washington D.C.'s Paley Center after they refused to allow her to lip sync her performance. The Paley Center uses a live orchestra, so lip synching would be impossible.
Brandy's official excuse for cancelling the performance, however, was that she claims she suffered from various illnesses.
Here's a video showing her lip synching badly:
Here's her falling down: