Deleted Keyword included in all exported photos.

I’ve been using Lightroom Classic for nearly 20 years now (version 1.0) and have basically kept the same catalog all of these years.  Here recently I used the Smugmug plugin to export some photos to the cloud and I noticed that all of the photos had the keyword “Sheila”.  The only problem is, I removed the “Sheila” keyword from my catalog along time ago.  It’s not in my Keyword list anywhere.  

When I select any of the 200,000 photos I have and, in the Library module, view the Keyword Tags → Enter Keywords…. I do NOT see “Sheila”.  However, if I change the Keyword Tags dropdown to “Will Export”, everyone one of them has a tag “Sheila”.  You can’t edit this list.  I’ve tried everything I can to remove.  I’ve even tried exporting a folder that only had 30 or so pictures to its own catalog to see if a new catalog would fix the issue… no luck.

Need help on solving this…. the only thing I can think of is that there must be a “root” keyword somewhere and for some reason “Shiela” got set as the default value.