Looks like its just the background not being lined up with the border making it look like theres a second black timerbar behind the real one (thats really just the background thats ofset cos its not properly places within the border)
This is one of the cleanest, simplest, easiest-to-read UIs I've seen. No clutter, everything matches, and still manages to look like Warcraft. All you need is GreedBeacon to clean up your chat roll spam. :P Kidding! Love it. Let us know if you end up uploading it intact somewhere!