[Solved]-how to remove extra data point from x-axis in highcharts-Highcharts

You need to parse your data and provide x value as a string to make it work.

const parsedData = initialSeries.map(s => ({
    name: s.name,
    data: s.data.map(d => [d[0].toString(), d[1]])
}));

Demo: https://jsfiddle.net/BlackLabel/d9cmqbsp/