Rengar NEGATIVE damage?

Was playing a game today, I'll try my best to explain what happened, the Rengar had about 400AD and then a quest came up that he has to kill Kha'zix to get all his bonus stats from his passive? (think it's passive) and after this his stats went negative and he did no damage, his autos nor his abilities. He also said he had 130% crit chance but that was not visible to others
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