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Given the common shape to the lines I would suspect hot pixels not being rejected by the stacking software (Which can depend on various stacking settings) I am not familiar with Sequator though as to how you might set it to better reject hot pixels.
It would be worth having a look at individual subs to see if there are visible hot pixels in the right places. Remembering that the stacking aligns the stars so actual objects stay in the same place and anything fixed with regard to the sensor (Hot/cold pixels etc) will appear to move in the final stack.
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