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Hi Bart,
The filter direction has no effect whatsoever on haloes. I have demonstrated the math on Cloudynights a few times. The intensity of the haloes is linked to the quality of the AR (antireflection) and passband coatings on either side of your filter, and/or the presence of other uncoated/badly coated surfaces in the optical train (e.g. Panasonic 16Mpix CMOS sensor). Unfortunately there is nothing you can do about it except exchange the filter (sorry for the bad news), but maybe it is acceptable?
The direction can impact light leakage from around the edge depending on which side the filter the aperture stop is resting, but that shows up in flats and as bright streaks from stars slightly out of the FOV, different problem from what you are reporting.
Regards,
EB
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