Flickr is now auto-tagging photographs, based on image recognition magic. Some say that this has been going on for a number of months and Flickr is simply making it visible.
Naturally Flickr doesn't care for what's left of its Pro community, whose subscriptions are increasingly meaningless. And anyone's carefully curated image tags are now being spoiled without so much as a by-your-leave. Neither can you currently remove those auto-tags in bulk fashion through the Organizr, only photograph by photograph.
Some of us might not mind so much were those auto-tags vaguely correct or useful, or respectful of the country of origin of the photographer or the photographer's intended subject, or applied only to photographs that didn't already have tags.