If you finished 20 hunts, you won the map piece, the event is complete. There is no 21st hunt, it seems to just be a glitch. Don't worry about it. There is nothing else to win.
Wait for the next weapon to be available for HBs and play that event to win the next map piece. Meanwhile, play contract hunts and win blue crystals.
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Wait for the next weapon to be available for HBs and play that event to win the next map piece. Meanwhile, play contract hunts and win blue crystals.