It happens because you only have a certain amount of up-votes at 2% of your accounts value, 2c being the default of a $1 account (which everyone starts with). When that has run out, your up-votes become 1c and 0c thereafter until the week is up and your votes get replenished.
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Thanks for your answer. Makes sense. I thought I would only need to keep my voting power in mind. And that's always 80+% to 100% in my case. So I don't actually upvote too often.