Elements added tags to numerous photos
I recently upgraded to Elements 2018 from Elements 13. I tag some photos with a tag so I can copy them to my digital picture frame. I also tag some photos to copy to my spouse's digital picture frame. They are not smart tags. I recently did a search on my tag and copied the tagged files to my digital picture frame. There were around 1400 photos. That's around normal. I then searched using my spouse's tag. Many, many photos were retrieved that I am sure were not originally tagged with her tag. It looks like virtually every photo in the entire catalog (15,000 photos) now have the tag for her digital picture frame. I started untagging the ones that should not be tagged for her digital picture frame, but this is a very big, slow task. It appears that Elements added her tag to many photos without any input by me. Now I need to do a lot of work to undo this. I haven't checked other tags to see if they are similarly corrupted.
Any ideas to get back to where I was before this "help" from Elements? How do I keep this from happening again in the future? Thanks.