Moved to InDesign EPUB forum.
Since InDesign doesn't export an .mobi file, you must be using third-party software. Have you inquired in the forums and support departments of the company which produces that software?
Thanks for your reply.
It uses a plug-in.
InDesign export steps I follow: File > Export for Kindle = this outputs a .mobi file I can view in the Kindle Previewer.
You haven't identified your InDesign version, or the vendor for the plug-in. I'd guess InDesign CS6 and Amazon.
If so, you should check out the author forums on Amazon.com: