The default score for the problem bank and the score for editing the quiz are the same, but changing the default score for the problem does not apply to the score registered in the quiz and does not change the default score for the problem bank.
When you add a quiz from previous tests, set the default score for the quiz.
When you import a quiz from a question bank, it is imported into the default score set in the quiz from previous tests.
And because one quiz can be used as a different score in another quiz, if you want to change the score for that quiz, you can change it in Edit Quiz. (At this time, the default score for the troubled bank is not changed.)
Therefore, the score applied during the quiz evaluation is the score that appears in the quiz list in the quiz editing.
(Quiz - Assignment of questions in quiz editing)
(Question Bank - Basic Score for Question Editing)