I guess you don't know about the upvoting bots. A bulk of your upvotes are bots who are just tainting your post. I wrote about it yesterday - https://steemit.com/steemit/@liberosist/bots-upvoting-posts-an-investigation
It's the same bots that attacked my post too.
You talk about this one: bison015?
bison015 posts a lot of "keep up the good work" but I don't think it upvotes.
now I understand. thanks a lot