I have had this exact same thing happen to me but on PC. Started the event not really knowing what I was doing and completed it very easily, AI was set real low. I saw my leaderboard score, only top 73% so I upped the AI difficulty, removed some assists and tried again. I failed, lowered AI difficulty 5 more and then completed the event successfully but it showed the same results as the photos in this thread (passed with 0 points) and It also deleted my old score and now im not even placed on th