Thank you Elm for posting your lovely photos. I am in Thailand currently on work and my other photos from this lens are in my main computer at office. Will post after a month when I return.
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Why would you buy a 44mp camera to shoot 4K video? Seems like overkill or is there an advantage I'm missing?
You are choosing too low a value in quality at your save as jpeg step.
It is called posterization and is very common, it has nothing to do with camera settings or your other processing. Do it again but save the jpeg at over 80% quality, sometimes you even need to use 100%.