The series info is transferred from calibre based on the "Metadata Management" setting (found in Preferences | Change Calibre Behaviour | Sending books to device).
Metadata Management can be set to Manual / Automatic / Only on Send. If set to Automatic then on the second connection to calibre (ie AFTER the Kobo has "processed" new content) the series data will be updated on all content. Never having used either Manual or Only on Send, I'm not sure of all the repercussions,
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