Hi Alex,
I have done historgrams of each of your images in order.
To help, top to bottom is Lum, Red, Green, Blue.
The first image the blue and green channels are a bit high.
The second and last image the red channel is high.
The data is all there and really good detail but something is happening with the colour.
Im not too sure as im only a novice at processing.
All i do is stack in dss and then save as 16 bit tiff.
Then in photoshop change the curve a bit then stretch the levels a bit.
I never separate the colour channels but as i said before im only a learner.
I used these sites to sort of work out settings in DSS
https://www.stevebb.com/deep_sky_stacker.html
https://astrobackyard.com/deep-sky-stacker-settings/
Other than the colour thing these are really good images compared to what came out of my camera on Saturday night.
There not even good enough to excite a small child....
Cheers
Andy