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I voted post up it became +3 then i changed my mind
and decided to remove my vote -- it became 1.
Please fix it. Thanks.
This is the expected behaviour.
If you have upvoted, then to clear your upvote click the upvote button again i.e. it acts as a toggle. If you click the downvote button it (a) undoes the upvote then (b) registers a downvote. Hence the -2 change.