Those microvotes intermittently on your posts are probably from a curation trail. A human is voting your post a certain percentage, and the followers of the trail will automatically vote a percentage of that percentage. So if the leader of the trail votes 5%, and my max vote on the trail is 7% and I am voting proportionately to the trail itself, my vote will be sub 1%.
Assuming the total votes on your post meets the threshold for payout, I don't see any reason to be annoyed. Those sub 1 percent votes do add up. You just have to keep in mind that it's probably one person voting your post, along with a 100 tiny auto votes to back them up. I periodically go through some of the stuff I've auto voted and bump up my vote, so I'd say you are still getting some degree of exposure by being discovered by a trail
Thanks for explaining, I understand it better now.