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The .mobi file format is derived from html. Just like you can colour text in html you can color text in an .mobi file. I suppose the author of your ebook decided for the grey text to mark it as to be displayed as grey. for all the other text passages he most certainly did not decide to overwrite the default colour, so the reading software has no problem with overwriting the default behaviour.
Solution step:
Try to convert the file to html or epub. Then edit the file to either just clean the mark up from colour settings or colour it to your liking. You definitely need to know basic html and maybe about cascading style sheets to do so.
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