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Resolution at last.
I've narrowed the issue down to 3 sets of images that probably have inadequate SNR to process adequately - alignment of the images appears problematic evidenced by the pixel rejection maps, showing misalignment. Mixed with the image sets at large, these shorter exposure images would not align.
I think mixing the images one night from the other might be the problem. A better technique would be to combine similar image sets and then integrate together.
So, those stars that appeared out of nowhere are misaligned. Closer inspection of the image concerned shows the same all over - but I didn't pick it up at first. Lesson learned.
Possibly this should be in the beginners section as it seems no longer relevant to this forum.
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