[Question] Techniques to fix incorrect memorization?

One of the things I’ve been using Anki to memorize is friends’ birthdays, but I realized after a few weeks that I had entered one of them wrong, in a way that was confusingly similar to another:

  • Friend A: June 5

  • Friend B: July 5 (should actually be 6)

Now when I study the cards, for both friend A and friend B I can consistently remember that their birthdays are one of these two dates, but a week later when I review again, I can’t consistently remember which one.

It seems like Anki basically did it’s job (I did memorize the date), but I memorized “too much”. Are there any good techniques to fix this?

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