Accepted answer

The reason why you have this gap between every thousand is lang.thousandsSep Highcharts parameter. Here you can find information about this parameter:

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.

    lang: {
      thousandsSep: ','

Here you can find live example how it can work:

Best regards,

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