Mail problem

No big deal I hope but annoyiny. My inbox in the Apple mail program shows 6 New messages but, there are non unread that I can find. Now when a new message comes in the counter moves up 1 and after it has been read it reduces by one, Still the counter shows 6 new messages. I used disc utility just in case that would help. I went through Preferences but found nothing there. I'd sure like to clear it up and am Thankful for any help:(

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