score:12

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.

score:4

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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