Kobo assumes the author is in the format "FN LN". If there are multiple authors, it is "FN1 LN1, FN2 LN2, FN2 LN2". Without seeing how the authors as "LN, FN". If that is the case, then there will be two entries in the author list for "LN" and "FN" (As one of the names is "Agatha", I'm wondering if you have a "Christie" as well).
With what you show in the screenshot, it usually means you have the authors in calibre as "LN, FN" rather than "FN LN" and having the author_sort as "LN, FN". In general, it works better to use the latter setup in calibre as a lot of different things assume the author is "FN LN". If you fix the author in calibre, the drivers can do the update on the device the next time you connect. The Quality Check plugin can help with this.
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