The Top pick reviewing mode uses the single transferable vote (STV) method to determine winners.
This short video is a fairly easy-to-understand explanation of how STV works:
By default there is no ranked list of winners. The application in the top position is not more of a winner than the application in second or third position on the leaderboard. Should you need to generate a ranked list of your winners, see our dedicated guide: How to calculate a ranked list when using Top pick.