The overall WWR does not match with the single wall's WWR

[Kyle-Xu001]

In this case, window area is 81, wall area is 560, but the ground truth wwr is given 0.1286?

{
    "overall":
    {
        "wwr": 0.12857142857142856
    },
    "0":
    {
        "center":
        [
            -4.0,
            -6.5,
            5.0
        ],
        "direction":
        [
            -1.0,
            0.0,
            0.0
        ],
        "domain":
        [
            [
                -4.0,
                -4.0
            ],
            [
                -8.0,
                -5.0
            ],
            [
                0.0,
                10.0
            ]
        ],
        "wwr": 0.0,
        "area": 30.0
    },
    "1":
    {
        "center":
        [
            -8.0,
            1.5,
            5.0
        ],
        "direction":
        [
            -1.0,
            0.0,
            0.0
        ],
        "domain":
        [
            [
                -8.0,
                -8.0
            ],
            [
                -5.0,
                8.0
            ],
            [
                0.0,
                10.0
            ]
        ],
        "wwr": 0.13846153846153847,
        "area": 130.0
    },
    "2":
    {
        "center":
        [
            0.0,
            -8.0,
            5.0
        ],
        "direction":
        [
            0.0,
            -1.0,
            0.0
        ],
        "domain":
        [
            [
                -4.0,
                4.0
            ],
            [
                -8.0,
                -8.0
            ],
            [
                0.0,
                10.0
            ]
        ],
        "wwr": 0.1125,
        "area": 80.0
    },
    "3":
    {
        "center":
        [
            -6.0,
            -5.0,
            5.0
        ],
        "direction":
        [
            0.0,
            -1.0,
            0.0
        ],
        "domain":
        [
            [
                -8.0,
                -4.0
            ],
            [
                -5.0,
                -5.0
            ],
            [
                0.0,
                10.0
            ]
        ],
        "wwr": 0.45,
        "area": 40.0
    },
    "4":
    {
        "center":
        [
            -2.0,
            8.0,
            5.0
        ],
        "direction":
        [
            0.0,
            1.0,
            -0.0
        ],
        "domain":
        [
            [
                -8.0,
                4.0
            ],
            [
                8.0,
                8.0
            ],
            [
                0.0,
                10.0
            ]
        ],
        "wwr": 0.15,
        "area": 120.0
    },
    "5":
    {
        "center":
        [
            4.0,
            0.0,
            5.0
        ],
        "direction":
        [
            1.0,
            0.0,
            0.0
        ],
        "domain":
        [
            [
                4.0,
                4.0
            ],
            [
                -8.0,
                8.0
            ],
            [
                0.0,
                10.0
            ]
        ],
        "wwr": 0.1125,
        "area": 160.0
    }
}