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stop doing things that give you negative ncr rep, it doesn't always tell me when i'm getting negative rep eitherthere's a glitch where if you put on ncr faction armor it will reset your reputation with them maybe that's why

If you help the legion your NCR rep may go down without notifying you. Check the wiki page on reputations and see if you're gaining infamy or losing fame - gaining infamy might be something you're doing, but losing fame is a bug and shouldn't be possible.

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