@anyx created @cheetah for a very good reason, on a simpler platform. As Steemit grows, @cheetah requires improvements that @anyx seems unable to undertake. I try to alert @anyx to situations like this (by tagging him as I have here) to enable him to judge the need to improve @cheetah given the constraints imposed on him.
Anyway, I wouldn't worry about an occasional upvote from @cheetah. If they become constant, then further action on your part may be necessary. I have found that few authors that aren't plagiarizing find it necessary to take further action.
Folks can see that you are posting the same content in more than one place, and there's good reason to do that.