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I have been trying to clear this bug but i still not getting the point why it occurs.
check the code at http://jsfiddle.net/3RKL4/
The tool tip works only for the first and last points.
Is this a bug in highcharts or the code is wrong ?
If the code is wrong can any one help me ?
Ideally Highchart requires data to be increasing order of time. Your data doesn't seem to satisfy that, it doesn't work event with 3 points http://jsfiddle.net/jugal/3RKL4/5/ Reversing the order fixed it @ http://jsfiddle.net/jugal/3RKL4/6/