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My favourite $0.02 theory is that it's a combination of intensity gradients near the limb and registax locking onto those gradients as a "feature" to be tracked & stacked, making them stand out and as a side effect blurring the "real" features that you wish Registax would use instead.
Maybe try a smaller alignment box in registax that covers only the inner part of teh disk, and exclude the troublesome area.
Bird
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