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It's because the other player used up all their tiles first.
From the rules post pinned in this forum:
[quote]AlphaJax End Game
The game ends when one player plays every tile in his rack, and there are no tiles remaining to draw from. Alternatively, the game ends in the event of three continuous passes from each player.[/quote]
Sorry guys, I didn't know the other player was out of tiles. I was expecting some type of notification that the player was out. I used to play scrabble a lot. As I remember you could see the other person and their rack.... No pun intended.