Accepted answer

Here a workaround. The trick is to set plotOptions.series.enableMouseTracking to false.

This because the gray line is the "mouse track" area of the chart and for some reasons it's not hidden by wkhtmltopdf.


A bit late to the party, but I found adding this to the CSS I send to wkhtmltopdf hides the offending mouse track area, plus the shadow under the lines that doesn't look as good in the PDF version.

g.highcharts-tracker, g.highcharts-tooltip, path[isShadow] { display:none; }

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