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Is it possible that FAQ 30 might have a bearing:
Are the tags of imported books dependent on how I import?
Yes. EPUB books usually embed multiple subject attributes, which are extracted and saved as tags after import in general. However, if they are imported via OPDS catalogs, then the tags of the corresponding OPDS entries completely override the embedded ones.
Also can you give an example of the tags you see being arbitrarily assigned?
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