Is there any chance you could repost those as bitmap (.bmp) images so that I can see them more clearly. These are compressed so I may not be seeing exactly what you see.
I've attached another colour map in a different format. See if you can narrow your problem down to a particular image format. It's rare for web sites to use true bitmap format. You will normally find .jpg and .gif files used as backgrounds and images. You can sometimes see imperfections with images that try to use a lot of colour, but not normally quite as severe.
I'm not convinced that the greyscale problem you found in the game is the same problem, as a light shader is used here. You can clearly see that the image itself is perfect, but it looks like it was rendered poorly, or the colour was reduced. It's possible that this could be due to the game egnine itself, or some settings within the game.
I think it's best to focus on image format's first and rule out every possibility one at a time. It's still possible this could be a hardware issue (however least likely, since you are able to see some greyscale).
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