w2ui grid bug sort

by wondertalik

HTML

<script src="https://rawgit.com/vitmalina/w2ui/master/dist/w2ui.min.js"></script>
<link rel="stylesheet" href="https://rawgit.com/vitmalina/w2ui/master/dist/w2ui.min.css">
<div id="grid" style="width: 100%; height: 350px;"></div>

JavaScript

$('#grid').w2grid({
    name: 'grid',
    show: {
        lineNumbers: true,
        toolbar: true,
        footer: true,
        toolbarReload: true,
        toolbarColumns: true
    },
    columns: [
        {
            "field": "FechaAlbaran",
            "caption": "Mes",
            "size": 50,
            "sortable": true,
            "resizable": true
        },
        {
            "field": "Familias",
            "caption": "Familias",
            "size": 50,
            "sortable": true,
            "resizable": true
        },
        {
            "field": "2001__",
            "caption": "2001",
            "size": "130px",
            "attr": "align=center"
        },
        {
            "field": "2003_",
            "caption": "2003",
            "size": "130px",
            "attr": "align=center"
        },
        {
            "field": "Diferencia",
            "caption": "Diferencia",
            "size": "130px",
            "attr": "align=center"
        },
        {
            "field": "DiferenciaPercent",
            "caption": "%",
            "size": "70px",
            "attr": "align=center"
        }
    ]
    ,
    records: [
        {
            "w2ui": {
                "children": [
                    {
                        "w2ui": {
                            "children": []
                        },
                        "recid": 304,
                        "Familias": "VINS ESPANYOLS NEGRES",
                        "2000__": "0",
                        "2001_": "6.840",
                        "Diferencia": "6.840",
                        "DiferenciaPercent": "100.00"
                    },
                    {
                        "w2ui": {
                            "children": []
                        },
                        "recid": 305,
                        "Familias": "VARIS CUINA",
                        "2000__": "0",
                        "2001_": "9.145",
                       ...