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It's because automatic chrominance/luminance noise reduction is being applied in the third tab of DPP.
The higher the ISO, the more aggressive the reduction becomes.
Feel free to reset the sliders to 0 and click Apply. From memory you can disable automatic chrominance/luminance noise reduction in the preferences.
I have now created recipes for all my cameras now; from ISO-50 to ISO-51,200, which contains standard settings that I like, as well as the default chrominance/luminance reduction settings for that particular ISO. I now move each ISO image into its own directory under the parent date/camera directory, and blanket apply the recipe for that given ISO to that batch of images.
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