Notes disappear and reappear in Question Bank

My final quiz is in a Question Bank. I've included a Notes tab in my course menu, and for some questions their text appears inside the Notes and sometimes the Notes tab completely disappears. It appears/disappears consistently for the same questions (it isn't random) and it is not tied to the type of question or their order. There is nothing in the Notes when I edit the course. It is including the text in Notes automatically.

Any ideas on why it is so inconsistent? I use Notes in the rest of the course for Closed Caption.

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