I just finished a round robin tournament with 4 players where 3 of us got 2 wins, meaning we had a 3 way tie. After a while it declared me the winner, But I wanna know if it randomly chose me or if it decided based off of some criteria

if you ahve AB and C with thr same amount of losses and wins and A lost to B, B lost to C and C lost to A then the winner is decided randomly.
If everyone had 2 losses, but A beat both B and C but lost to 2 others, then A wins it because head-to-head is the best for him.