Below is the Help link for Line Chart, scroll down to the Style settings are, in particular there check on Grouped/Stacked piece, as given you have two dimensions and a single expression, from the way I read things, it is going to be grouped/stacked, so I believe the result is as expected here:
http://help.qlik.com/en-US/qlikview/November2018/Subsystems/Client/Content/QV_QlikView/Line_Chart.ht...
Sorry I do not have anything better here, but maybe someone else can shed some further light upon things at this point.
Regards,
Brett
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