Why is the max for the 7th assert 50 instead of 53 (6+6+7+9+9+9+7)?

        [
        [6*],
        [0, 6*],
        [3, 0, 7*],
        [0, 4, 2, 9*],
        [4, 4, 3, 6, 9*],
        [3, 1, 0, 5, 9*, 0],
        [8, 9, 7, 7*, 3, 4, 5],
    ]

I know I'm wrong and I'd like to know what I'm missing. Cheers