The MOBI format is only necessary for very old Kindle devices. If your kindle isn't ancient try using Calibre and convert the MOBI to AZW3 and see how that comes out. You can use Calibre to send the book to your Kindle if it's connected to your computer with a USB cable. On the Kindle delete the MOBI format of the book before you send the AZW3 format to avoid confusion of having the book in multiple formats. You can also do that deleting with Calibre.
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