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I'm no expert when it comes to editing images, believe me, I'm very much in the begginers club, but it looks to me as though your white balance is off.
How are you stacking them? dSS? If you are, set it to align the colour channels and set the black point to zero. Or adjust the whe WB yourself.
I had a few images that came out with the same brown cast and the above helped a lot.
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