vote with less than 10% of voting power

I posted a new article via the Steemit interfase. My post got autovoted. I removed that vote, since I did not want to cast an 100% vote to my post. I tried to vote the post with about 5%, and the vote wouldn´t go through. When I changed the percentage to a little bit more than 10%, it worked. Maybe there is a downlimit at 10%. Thought I´d comment.