score:2

Accepted answer

the problem is in datagrouping, when disabled works fine: http://jsfiddle.net/34tfg/1/

datagrouping is method in highcharts to approximate points and display them when width of the chart is not enough, e.g. how to display 10 000points in a chart of width 1 000px -> 10 points in a one pixel..? and when datagrouping is used, new points are created, so all your custom options like 'names' etc. are lost (at least not accessible).

code:

    plotoptions: {
        line: {
            datagrouping: {
                enabled: false
            },
            turbothreshold: 10000
        }
    },

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