I think the Kobo is expecting the Author name to be in the form Firstname Lastname not Lastname, Firstname. The Kobo uses comma as the separator for multiple authors.
By default, calibre has 2 different fields for Author:
authors: in the form Firstname Lastname
author_sort: in the form Lastname, Firstname
If your calibre is like this then make sure you use authors rather than author_sort when you transfer your books via calibre send-to-device.
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