DevExpress XrChart curve prints to PDF but not on Print-Out - pdf

I have two line charts on a DevExpress xtrareport. For some reason, the curves are drawn fine on one but not the other.
If I print the report using PDF995 application, or using Microsoft XPS document Writer, both charts appear fine.
However, if I print the report directly to the printer (a TA/UTAX), the curves on one of the graphs don't appear at all.
This is a screenshot from the output of the XPS document.
But when it's sent directly to the printer, the curves don't appear on the left hand graph. Below is a scan of the same graphs printed to the printer.
I'm fairly positive it is related to the data in the data series because if I switch the binding so that the right-hand graph uses the current left-hand data, I get the same problem but with that graph. However, on examining the data, I can't find anything amiss.
The data comes from a list of Tuples (string, decimal, decimal):
The SeriesDataMember is bound to Item1
The ArgumentDataMember is bound to Item2
The ValueDataMembers Value is bound to Item3
And the report is printed using the DevExpress ReportPrintTool.Print() method.
Strangely, the graph on the left in the screenshot is printed fine, and that gets its data from a similar data structure.
What could be different between printing to an actual printer and printing to a PDF writer? (PDF995)
Edit
As per my comment, starting the curve at -0.01, -0.01 allows extra space below the origin and then the curve prints fine. This currently works as a workaround as the graph will never be printed in a fine enough detail to notice the difference between 0.01 and 0. But still... weird...

is that curves visible on the real printer if you try to print result Microsoft XPS document file?
currently i think that your problem is in your printer : (

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