[Solved]-RevealJS and Highchart Mouse position Tooltip Issue-Highcharts

It is caused by setting transform's scale on the wrapping div. You can read more about on Highcharts github here.

There is a workaround for this which seems to work in your example:

Highcharts.wrap(Highcharts.Pointer.prototype, 'normalize', function (proceed, event, chartPosition) {
    var e = proceed.call(this, event, chartPosition);

    var element = this.chart.container;
    if (element && element.offsetWidth && element.offsetHeight) {

        var scaleX = element.getBoundingClientRect().width / element.offsetWidth;
        var scaleY = element.getBoundingClientRect().height / element.offsetHeight;
        if (scaleX !== 1) {
            e.chartX = parseInt(e.chartX / scaleX, 10);
        }
        if (scaleY !== 1) {
            e.chartY = parseInt(e.chartY / scaleY, 10);
        }

    }
    return e;
});

live example: https://codepen.io/anon/pen/GxzPKq