Someone better versed will have to explain this better.. but a logical answer would be that your steem power is low enough to drag the overall average down for the post. Since collectively there is less steem power/vote behind the post, the value goes down.
RE: on some posts my upvote brings up
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on some posts my upvote brings up
Or other people are downvoting that same post in the time it takes you to refresh the page.
Downvoting a post can decrease pending rewards and make it less visible. Common reasons:
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