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No expert but would guess it's your eyepiece or eyes. Only as the scope here has been out of collimation every which way but never seen that (but just read what Rob said, which contradicts that). Does it happen with your other EP's?
Add - see below from Wikipedia:
Internal reflection and scatter
"Internal reflections, sometimes called scatter, cause the light passing through an eyepiece to disperse and reduce the contrast of the image projected by the eyepiece. When the effect is particularly bad, "ghost images" are seen, called ghosting. For many years, simple eyepiece designs with a minimum number of internal air-to-glass surfaces were preferred to avoid this problem. "
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