Let me see if I can help clear things up. This is how I understand it.

When you post using Busy.org, and you add "busy" as one of your tags, you get 1 upvote per 24 hours from Busy.

The amount of upvote you get depends on how much Steem Power is following you. This is not your own SP, it's the SP of your followers.

So if you don't have powerful followers, you get a very very small upvote. If Ned or Freedom is following you, or a bunch of whales, you get a high upvote.

Now there are two accounts that upvote for Busy: Busy.org and Busy.pay. Busy.org has lower voting power, and gives out the lower upvotes. So it is likely you've been upvoted by Busy.org and not Busy.pay, because Busy.pay gives out the larger upvotes.

This was how I saw it working a year and a bit ago when Busy was active, but they seem to have gone quiet and are powering down, so their upvotes are not that high anymore. Also I am not sure they are updating their voting bots, so it may be that they're not including new accounts after the date they stopped being active.

Hope that helps.