My wordpress blog has "/?livehit=" in the url. What is that?

How do I remove it?

[peepin2me]

I noticed the following page in google index
www.mywebsite.com/wordpress/?livehit=
It is a mirror of the homepage
www.mywebsite.com/wordpress/

I'm not sure why or how the "?livehit=" part appeared in the URL. I'm worried I'll be affected by the duplicate content penalty.

Somebody plz help

[peepin2me]

Update - The?livehit= page is listed in google's supplemental index