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I thought so too initially, but it's not happening to every post with that tag.

Maybe it only happens to posts where steemit if the first/primary tag. I added steemit as a tag later to one of my posts and didn't get those bot votes.

I think you may be onto something there.

Your first tag becomes your category. Maybe that's what it is, but I'm getting random bots on any tag... more if you use steemit. Circlejerk bots. :)