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If I go to https://webapps.stackexchange.com/unanswered, I see a lot of questions answered. Maybe it's caching of some sort?
A question with no upvoted answers is considered to be unanswered.
There is explanatory text in the right column (as there is for all the tabs).
You are right, but if you see closely, Unanswered Questions have 4 sub-tabs which are :
So now click on Unanswered Questions & than click on no answers sub tab, now you won't see any answered questions.