Currently a flashcard can be learned by clicking the learn button or by clicking the card itself, but to unlearn it only the "unlearn" button works. In mobile view the button is not available, making it impossible to unlearn accidentally marked cards.
Suggestions:
Make the button-wrapper -unlearn in problem-wrapper -learned width 100% and z-index 1001
In the long term, consider showing the learn/unlearn and ignore button below each card, or as a small icon to the left of the card in mobile view.
Currently a flashcard can be learned by clicking the learn button or by clicking the card itself, but to unlearn it only the "unlearn" button works. In mobile view the button is not available, making it impossible to unlearn accidentally marked cards.
Suggestions: