Really mess up with tags

My site has about 4000 photos and have ~40 people tags. For some reason, when I use Import images with tags, the system creates multiple tag records for the same person appearing on different images. At the end, I don’t have 40 tags but 3500 tags with duplicate names.

I tried to delete everything and start from new. But such action had mess up the auto_num in mysql. And I have to manually reset the auto_num counter. Certainly, spent hours to track down how photo-gallery uses tagging and reset index on wp-terms.

Hopefully, you should have a fix because I really don’t want to use NextGen anymore.