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I'm not really familiar with the camera, but could it be light pollution instead?
One thing, you might want to knock back the ISO on such bright targets. It's reducing your total dynamic range and burning out the cores of the stars while not gaining you any extra faint detail. That's not what's causing the brightening in your image but it's not helping you either. Probably around ISO 400 (check out DXOmark.com for their sensor ratings) would be good for you. You can always make things brighter by stretching the image in GIMP or Photoshop.
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