I don't think it is because of the highlights or saturation. My opinion is because of the artifacts that can be seen if you zoom in a bit around some highlight areas and the trees on the horizon.
You did not post the original picture, so it's not easy, but I think that @Ricky336 is right. In addition, you have in your histogram some blacks and whites missing. There may also be a light noise problem.
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ABAMBO | Hard- and Software Engineer | Photographer
It is from original picture i cant fit full size in 10 mb restriction. There is no noise besides native iso160 specially on xtrans sensor what doesnt do mutch color noise. Whites missing ? Only problem is what ricky pointed out, and its fixed no need to search else for sake of finding somethhing there is not 🙂
I don't think it is because of the highlights or saturation. My opinion is because of the artifacts that can be seen if you zoom in a bit around some highlight areas and the trees on the horizon.