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unfortunately this is because of the 7-day payout-system on the steem-blockchain. Only the upvotes from people seeing this post in the first 7 days after publishing actually contribute to the valued amount of $34.16.
People like me who see this great post after that 7-day period can still upvote it but won't actually pay the author with our upvotes.

You can upvote some newer posts/comments from the author instead. That's what I do.

Couldn't agree more, this post should deserve at least 10 times more!