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A moon image will always look better than a star image if the atmosphere is not steady enough to support a sharp image at the magnification you're using. The moon is craters within craters within craters and you may not realise that you're missing out on finer details if the image is blurred just a little from unsteady air. With the star you only have fine detail to deal with so the image will look worse in comparison to the moon. There may be nothing wrong with the eyepiece.
-Tony
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