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Reflections from flatteners and reducers became a real issue about 5 years ago when these large format sensors like the 16803 became popular.
Scope designs changed and most now have a corrector of some sort at the back of the scope.
This was usually an issue with filters not being antireflection coated well enough and led to mark 2 versions of Baader and Astrodons.
As Marc said it was a reflection between the flattener and the filters back.
If that proves to be the cause you may need to upgrade the filters.
I am curious to see how this plays out.
Greg
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