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Hello Chris, many interference filters show similar hallmarks, and while AR coatings help, reflections can still pop up from deeper down in the filter.
( FYI some narrow band filters have 64+ layers)
They are also spectrally localized....and can get worse at the peak QE wavelength of your camera.
There is usually no easy fix, other than to try another filter or manufacturer. Making sure your filters are exceptionally clean also helps.
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