You apparently have a stray clip floating around past your movie's end.
Press the \ key to view your entire timeline. Click and drag over the area beyond your movie to snag any stray clips and then press Delete.
The Work Area Bar (the light gray bar along the top of your timeline) should automatically resize to cover only the "legitimate" length of your movie.
Welcome to the forum.
I agree with Steve. You most likely have an "Orphan" out beyond where you think the Timeline should end. This article goes into more detail: http://forums.adobe.com/message/2887552#2887552
You were right. There was a straggler lurking out there. I deleted it and was able to get the Work Area Bar to snap back to the correct video length.
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