Dark verticle shadows in astro panorama

Hi I am having trouble with panoramas stitching. I use a 24mm lens mounted on a tripod with a pano head adjusted for parallax as well as being centered and level and shooting at 15 deg apart. When I stitch in Light Room the results are dark vertical shadows in the sky, they look like spot where each photo was stitched. I synced all the photos with lens corrections made, and adjusted the amount of vignette, but still have these lines. I tried shooting at every 18 deg due to the lens being wide angle and found that some panos came out much better and I thought I had the problem fixed, but the lines began to show up again in other panos. .

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