Roon overriding file genre tags

In library import settings I have Roon genres unchecked and file genres checked, but Roon is overriding file genres and showing them under genres that don’t exist in the file tag. When I select the Genre view there are genres listed which don’t exist in any files. For example I have several Canadian Brass albums tagged as “Christmas”, but they show under a genre “Orchestral Pop” and no “Christmas” genre is listed. I’ve verified the settings, cleared the Roon dB and reloaded the library, cleared and reentered the file genre tags, but the problem persists.