Someone probably got disconnected after starting the fight. It happened to me against IW the other night. Hit start. Loading wheel just spun and spun. I waited several minutes and the fight didn't start. My only option was to close out the game and restart. When I went back in, all charges were gone.
Either someone forced closed the game during the fight or it crashed. Similar to war you should restart your game before entering a raid fight. Invisible woman fight should be done with the small free team revives you get anyway since willpower healing will end up healing you a ton