Hi, you are welcome.
The plugin itself does not generate those files. Hence, unless the plugin broke with a recent version of Calibre (sorry, I no longer have time to maintain the plugin), either they were included by the plugin because they were in the exlibris directory specified in the plugin settings, or they were part of the original EPUB which already had a "exlibris" directory and a name collision occurred when the exlibris was applied by the plugin.
If you can share the EPUB, I could be more precise.
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