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I agree that it is fixed noise that has not been removed by darks that then streaks when stacked. The images will have moved due to tracking errors and when aligned the fixed noise appears as streaks.
Taking many darks and averaging them before subtracting the darks will help.
There will be random noise in a single dark and this noise is subtracted from the data image as well as the actual dark image.
Try it by taking 2 separate darks and subtract one from the other. The resulting image should be a perfectly even black image with every pixel measuring 0.
This will not be the case.
good luck with it.
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