It can be somewhat arbitrary. I remember posting a link to a BBC article which got downvoted and eventually flagged. Two weeks later I posted a link to the ori

It can be somewhat arbitrary. I remember posting a link to a BBC article which got downvoted and eventually flagged. Two weeks later I posted a link to the original research the article referred to and that time it was heavily upvoted. I think unless your posts are getting repeatedly downvoted its not worth worrying about.