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Here is a screenshot of my "select your next badge" window.
As you can see in the screenshot, my rep was 1905 but I have 1/100 for proofreader badge. I took that screenshot recently, but I have been seeing that 1/100 for quite a long time now. I know that a user with less than 2000 rep doesn't have Edit Questions And Answers Moderation Privilege. So, how was it possible for me to get that 1/100 for proofreader?
I have a suspicion though. I think that 1/100 came from this question of mine. I get this suspicion because, as far as I remember I once edited that question without logging in. Also, you can see that the question was edited my Mr. Community♦︎.
I am tagging this question with "bug" tag, because I had to choose one from "discussion" and "bug", and the latter seemed right to me, though I want to think that this is not a bug!