OK. I don't think that is the issue because the camera has 4608x2592 color pixels and the 2x2 binned image has 2304x1296 mono pixels. If your hypothesis was true I would expect 4608x2592 monopixels.
Also, in the setup I didn't ask for mono images.
Thanks for the suggestions, though. Next clear night I'll set up for unbinned images.

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