When you add a close marker {{c::}} to a close note, it creates a card. When you delete one, thereās nothing left for that card to ask about. But Anki doesnāt delete the card right away, just in case.
If you edited it in such a way that Anki canāt find that cloze marker anymore, you get the same result. Do you want to post the text of your note field here so someone can take a look at it?