I am updating my question banks for a course, but within my banks are a bunch of banks from someone else's section of the same course. I don't know how these got into my course. If I delete them, will this other person's course be impacted or will it stay intact on their end since they're their question banks?
I would test this before doing too much, but I'm fairly certain those are copies of the banks in your course. You can only see banks in other courses from within a different course if they are bookmarked. So if the bank is NOT bookmarked when you see it in your course, and the other instructor does not have access to go into your course and bookmark it for their use; it should be a copy that only you have access to.