[Solved]-Zoom in not working on Highmaps-Highcharts

this must be a bug, it works if you change your coordinate data. jsfiddle:

var geojson = {
    "type": "featurecollection",
        "features": [{
        "type": "feature",
        "properties": {
            "name": "a"
        },
            "geometry": {
            "type": "polygon",
                "coordinates": [
                [
                    [3125, 6250],
                    [5625, 6250],
                    [5624, 8750],
                    [3125, 8750],
                    [3125, 6250]
                ]
            ]
        }
    }, {
        "type": "feature",
            "properties": {
            "name": "b"
        },
            "geometry": {
            "type": "polygon",
                "coordinates": [
                [
                    [6875, 6250],
                    [9375, 6250],
                    [9375, 8750],
                    [6875, 8750],
                    [6875, 6250]
                ]
            ]
        }
    }]
};

// initiate the chart
$('#container').highcharts('map', {

    mapnavigation: {
        enabled: true,
    },

    series: [{
        mapdata: geojson
    }]
});

i suggest filing an issue on github, and we'll look into it in detail.