This section of the basic reddit guide should help explain it. They are fuzzed as a countermeasure to spam-voting. There's an algorithm somewhere in reddit's source code that identifies accounts that are abusing the karma system in some way (mass downvoting a user, sub, or something). When such accounts vote, they don't actually affect the score anymore. To hide this so that they don't realize they have been caught and jump to another account, the vote is fuzzed. You can't tell whether your upvote was ignored or someone downvoted simultaneously.
toadstule11 karma
This section of the basic reddit guide should help explain it. They are fuzzed as a countermeasure to spam-voting. There's an algorithm somewhere in reddit's source code that identifies accounts that are abusing the karma system in some way (mass downvoting a user, sub, or something). When such accounts vote, they don't actually affect the score anymore. To hide this so that they don't realize they have been caught and jump to another account, the vote is fuzzed. You can't tell whether your upvote was ignored or someone downvoted simultaneously.
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