Serie flagged but not already seen

Hello on a 9.2.6 and may be earlier, I have a TV serie on a local disk that I haven’t seen yet but it marks it as seen with the relative flag. There is no possibility to flag as “Not seen”. Obviously this series, being flagged, does not appear in the list of series on the menu but can be accessed either through “video” or after being included in the favorites. How do I solve this little problem? Thank you.

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