Thank you for your reply, but I think it isn't connected with autostretching, debayering and something like that. When I open both files in PixInsight and zoom it up the differerent patterns appear.
Left one is 'green' image after debayering (and its pattern looks 'correct') and right one is 'blue'.
'Green' image is one of 25 green images taken and 'blue' is one of 25 blue images taken next night, therefore some systematic behavior is occured and I try to find a sensible reason for it.
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