The repeated question can be evidence that the explanation needs a new route.

When the same question comes back a third time, the usual instinct is to repeat the answer more slowly. Repetition rarely helps, because the trouble is not volume or pace; the path you took does not connect to what this person already knows. A question that keeps returning is information about your explanation rather than about their intelligence. Somebody is telling you the road does not go through.

Next time you hear a question twice, change route entirely. Try an example, a drawing, or start from their side. Ask which part of the last version was clear, then build from there.