When the button is clicked, it considers that all players within a few blocks of the button have completed it. It will not choose the nearest person, but is instead bounded to however many blocks that is. Seeing two people complete it at the same time like that isn’t uncommon, especially if two friends are parkouring togetherTeleportation upon completion of a parkour isn't instantaneous, meaning a player can potentially register multiple clicks on the end button. Due to this, the server considered a player in an earlier section of the parkour to have finished as well.
