All cards come up as duplicated with new update

Hi there,
After closing and reloading anki to update to the latest version, every new card that I add to any deck comes up with the red box to say it’s a duplicate card, despite it not being a duplicate. When browsing the cards, anki has not duplicated the cards, but the big red box saying that it is a duplicate card is frustrating.
Any help/ advice greatly appreciated!

https://forums.ankiweb.net/t/every-card-i-make-is-labelled-as-a-duplicate/

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