HP Designjet Z6100PS printing lines transparent

Hi! I'm using a Bentley plt driver rather than a Windows print driver. When I send plots to a particular printer, in which in this case it's the HP Z6100PS plotter, the vector lines are plotting transparently, (i.e a red line and blue line when crossed, produced a purple line...)

 

Has anyone experienced this with the HP Z6100PS? Is there a way to toggle this off? Thanks!

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