I've seen a few users on SO that, even though they have answered many questions and received many upvotes in the past, they have 1 or very little reputation. For one example that I stumbled onto, refer to this user (sorry for picking one in specific, but it serves as a good example).
In the reputation tab, I can see that he should have around 300 reputation, at least, and I'm pretty sure not ALL of his answers were voted up by the same user, since some answers have them have 4 or 5 votes. How did it happen that he, and other users I have stumbled upon, have so little reputation, when it's not shown how it was lost?
Sorry if this is a duplicate question, but I couldn't find the answer anywhere, and I'm just wondering.