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ORIGINAL_<format> files are created if you do like to like conversion e.g. EPUB to EPUB. They are what's written on the tin, i.e. the <format> file prior to conversion. They are also created by the Polish Book tool, and perhaps the Modify EPUB optional plugin.
The creation of ORIGINAL_XXXX files can be turned off via the save_original_format Tweak, but doing that won't get rid any that already exist.
Suggest you run the Library Maintenance->Check library tool and clean up any anomalies reported in stage three. Then to get rid or all the ORIGINAL-XXXX formats: select all books (Ctrl+A), and use the Remove books->Remove files of a specific format from selected books tool to remove the ORIGINAL_XXXX formats
BR
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