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I am very new to astronomy, and know little about it, but no one has replied so here goes. I have been getting double images of Venus when photographing through a DSLR at certain apertures. Not sure if it is the same thing you are getting here.
If you have images of it, try and see if the two objects are equally opposite of the centre of the picture, both in vector and distance. In my case, with Venus, the shadow imaged moved closer to Venus with time (as Venus approached the centre), however, if you were tracking with it, the shadow image may have been moving with you.
I believe the effect might be lens flare. Are you using a refractive telescope?
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