epub to mobi conversion ncx to navpoint problem

I have an epub that I have formatted for converting to mobi. It looks great and everything works perfectly with the small exception of the final navpoint. I have an inline toc that my Kindle will use and I have a regular epub-style ncx/toc that should convert to the navpoints on my Kindle. All the navpoints in the ncx seem to be converting Kindle navpoints perfectly except for the final one. This happens on rare occasion but I can never quite figure out why. When I compare it to epubs that have converted and worked perfectly, I can't see any difference.

Has this ever happened to anyone else or sound familiar? Does anyone have any ideas what may be causing this or how I can fix it?

I'm not sure what details may be useful in troubleshooting this issue so please ask away.

Thanks.

- Byron