I don't think that it will decrease your experience, but you won't get many soul gems if you give out fake votes. This is the reason you have to verify the articles correctly. It happens to every person to press the plagiarism/spam button accidentally, but I'd recommend you to not do it on purpose.
in 3 steps
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Every game has some quests for which you will receive Soul Gems.
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does anybody know that if you vote wrong can decreases our exp?