Right-click "Authors" in the tag browser, click "Manage authors," and start looking for any URLs in links column. Remove or replace as needed.
As well:
Preferences > Look and Feel > Book Details > Clicking on author name should: (options here). Personally I like to use "Search for the author in your Calibre library."
I'm not sure where to check for the URLs in the book's metadata though. Somebody else can help with this.
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