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Try blackening the edges and chances are that will disappear. It was near Alnitak which is probably the worst reflection causing star in imaging. As to the physics of reflections - I think that can get pretty complex pretty fast.
Its not a comment on the brand of the filters as all filters have this issue. I am not aware of any of the filter manufacturers blackening the edges of their filters. It only takes a few minutes to paint the edges with a permanent marker. Just be careful, obviously not to get it on the main face of the filter but it does wipe off if you make a mistake, just do it fast before it dries.
I saw a similar reflection on a CDK17 image of mine recently. Only on a couple and it was also near a bright star and my edges were blackened but only with a permanent marker and perhaps a few areas weren't perfect. It was hard to see but it was there on a couple of subs. There was also some moon present.
Probably square are more prone to trouble as it forms a straight edge rather than scattering it everywhere with a circular filter. Easier to see the resulting reflection.
This blackening of edges is old data. I am surprised filter manufacturers don't do it. Eyepiece manufacturers have been doing it for ages. Televue eyepieces all have blackened edges of lenses.
Greg.
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