Not sure if this helps but, I had some issues with fits files when using my ZWO camera...
Essentially, if I set 8 bit fits, my data was monochrome & had hatch marks all over it (bayer matrix pattern) but, 16 bit fits was colour; maybe ASIAIR is converting them to 8 bit fits files; perhaps check settings to see if it gives you a choice, might be related perhaps?
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