Faces in Photos
I have a issue with some photos in my Photos library where the people are named but the Face 'ring' is not on the faces. If I try and move it to the face it simply springs back to where it was. If I delete the offending circles and add a new one I move the circle to the face and again it springs back to where it was. It is apparent on a minority of photos and seem to be ones originally named in iPhotos
Any ideas on how to clear the problem please.
This is on a late 2013 Mac running up to date Catalina