What is the difference between "downvote" and "downvoted"? Here is a screen shot from the Reputation sub-screen on the User tab:
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When you downvote an answer, you lose one rep point. This displays in your profile (only to you!) as downvoted
When one of your posts is downvoted by someone else, you lose two reputation. This displays in your profile (to everyone) as downvote
The wording is subtle, and could possibly be improved. As it is, it's just something you learn by association with the action that triggered it.