The MOBI format is ancient, the preferred format for most Kindles is KF8 (aka AZW3), see
https://wiki.mobileread.com/wiki/E-book_formats
Quote:
KF8 - (Also called AZW3) It is basically ePub compiled with the PDB wrapper and with Amazon DRM. This format is supported by all Amazon readers from the Kindle Keyboard 3 onwards.
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That explains why i suggested you try converting to EPUB. If the bold converts correctly to EPUB the problem is in converting to MOBI, but if it converts to italics the problem is converting Pages implementation of DOCX.
BR