Topics don't show all questions under some topics

Clicking on a topic that you know contains the question you're after may not allow you to find the question.
Take this question for example: https://extranet.atlassian.com/questions/2167047868
You can see that this question is tagged with 'move' but topic but that topic's page doesn't show the question for some reason:
https://extranet.atlassian.com/questions/topics/1724448771/move