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Calibre is treating the ampersand as specifying multiple authors. Somewhere as an optimisation in the handling of the dialog for changing metadata, it is converting the comma to an ampersand. Quite why the comma then ends up as a vertical bar I have no idea.
Internally calibre seems to hold authors in 'firstname lastname' format, with the sort field normally being set to 'lastname, firstname'. You may find it esier to simply live with this convention.
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