There's Somthing Wrong With My Wordpress...

There's someone I don't even know about who keeps leave comments on my Wordpress. The point is, I don't know what and why he is saying that.......

The most weird thing is, on my Edit COMMENTS page, I saw some of his comments didn't show where he post them from.

For example, when I click on View Post which is the right side of Edit Post ?# 12?, it actually shows Sorry, no posts matched your criteria. As a matter of fact, I never made a post named # 12, how could this comment possibly be posted?????

Oh, another question....... when I was trying to delete a comment. It actually goes like this--->

Sorry, you need to enable sending referrers, for this feature to work.