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This question was downvoted, and the downvote removed, and the user now has 3 rep, even though there are no reputation generating events on the user's page.
This is no longer the case. Casting a downvote now records the actual value (0 change in this case) and reverses that 0 value upon removing it...the user will correctly stay at 1 reputation.
It's "as designed" because the FAQ says:
I'm guessing a reputation recalc will fix this "by design" anomaly.