It may be that I'm working with a much larger data set, with about 150,000 line items. It may be some time before I have time to reproduce the error in the sample, for now I am specifically querying the cdn for the previous version and the error does not occur.
Specifically the y-axis label is too "zoomed in" and has too many data points when looking at my data, where as previously it was zoomed reasonably and the graph fit on the screen.