'Win the Button' tournaments give the dealer button to the player who wins the previous pot.
The player who wins a hand receives the dealer button for the next hand.
This changes the normal rotation of the button.
You can receive the button more often than in standard games.
You may also be in the blinds more often if other players win consecutive pots.
Some tournaments switch back to standard button movement later in the event.
Check the tournament lobby for full details of the specific event.