I had a quick check on my server and initially I found the same issue you’re facing. In the reorder admin term page where the post is missing, I reset the manual order (this fetches all the posts under that term, and resets the manual order). The missing post now showed up. Subsequently, I created additional posts in both terms and they showed up in the reorder lists of both terms.
On older versions of the plugin, the handling of manually ranked posts lists was not handled properly and posts would not be correctly added to the ranked lists when their terms changed or new posts were created. This now fixed, and I assume that your client’s manually ranked lists were built initially with those older buggy plugin versions.
To remedy this, simply reset the manual order for those terms missing ranked posts.
That worked!
Thank you Aurovrata. That saved a lot of hassle.
Oh good! Would you kindly take the time to leave a review? Your first one 🙂