If a player leaves a Crew and joins a new Crew during the event their score in their old Crew will be cleared. They will also not be able to contribute to their new Crew’s score during the current event and will need to wait for the next one.

This was done to prevent players from leaving poor-performing Crews and joining better ones just to win the prizes. 

In the Crew contribution list, they will be shown "Not Included This Round" next to their username. They will also not be eligible for the prizes this round.