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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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