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Yep I am learning Ha Oiii RGB also and get similar problems. The red can be from poor colour balance. In Nebulosity ( free trial and only $80) if you use image, RBG combine and try auto colour balance or do your own colour balance you can try different balances.
I often stack only 80 % of subs even after I have checked each fits for bad movement just in case there is one bad shot which throws DSS.i have found combining R with Ha and Oii with B and then plain G seems easiest as a start or hA Oiii and L with an LP or moon glow filter in any combo you like is fun.
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