metadata error--title and subject same, but not the same

I have been having a problem where Photoshop does not read nor retain the "Comments" metadata I have added in Windows Explorer.  I am working with photos of ancestors and want to note who, what, where, when in the metadata.

Having not been able to resolve that issue, I tried manipulating it in different ways to see what metadata Photoshop would read and retain. 

When I add the comments/description I want in the "Description" box in Photoshop, it saves as both "Title" and "Subject", but not "Comments". 

When I add the metadata in Windows Explorer as "Subject", Photoshop does not read nor retain it. 

When I add the metadata in Windows Explorer to "Title", Photoshop reads it as both "Title" and "Description" and will save as both "Title" and "Subject".