My answer of this question :
was upvoted , but received also a delete vote.
How can an answer that is not downvoted, receive a delete-vote ?
As explained by Shog9 from Why I'm casting delete votes in the Low Quality review queue?,
Review gives you a bit of a boost by allowing you to vote to delete 0-scored answers. This is done just to save you the step of having to down-vote them first and then vote to delete.