[Solved]-HighChart: Tooltip box thousand seperator-Highcharts

The reason why you have this gap between every thousand is lang.thousandsSep Highcharts parameter. Here you can find information about this parameter: http://api.highcharts.com/highcharts#lang.thousandsSep

As you can read here, this parameter defaults to ' '.

If you want to change this separator to comma, you can change it inside this parameter.

  Highcharts.setOptions({
    lang: {
      thousandsSep: ','
    }
  });

Here you can find live example how it can work: http://jsfiddle.net/uxx1ormz/1/

Best regards,