What's the difference between the button at the top called "Unanswered" and the tab under "Questions" button called "unanswered"?
It is not the same answers that appears in both, so they must have a different function.
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The "unanswered" page shows only the unaswered questions, which you can sort by different criteria.
The "unanswered" tab in questions is a sort option for ALL questions (answered and unanswered) : using "unanswered" tab in questions means that unanswered questions will be listed first (and answered at the end).