Double Posting

Since I upgraded to 2.1, the loop on my site (http://misstuned.com) randomly shows a post twice sometimes. I’ve done everything I could think of, I deleted the post, edited anything I could edit, but still just a few random posts will show twice on the front page only. I checked to make sure the post wasn’t truly double-posted, but you will notice on the doubles that the comments are the same. For some reason the loop is actually displaying those posts twice.

Is this a bug? Or would this more likely be some sort of MySQL or server error?

My guess is it has something to do with the autosave function, because of the calendar date being displayed on the post above the double only.

Any help or explanation will be greatly appreciated. Thanks for your time.