This question already has an answer here:
The Workplace featured question tab is currently displaying this question, which doesn't actually have a bounty. It does have an awarded bounty but I can see no other reason behind it suddenly reappearing in the tab.
Two users on chat confirmed seeing the same thing.
Feature Question Tab
EDIT: this question seems to cover the same bug, but I'm not sure if the featured listing persisted or reappeared, though I suppose the former is more likely.
EDIT2: As mentioned on the linked question, the question was removed from this tab the second another bounty was started.