What's Wrong with this Chart?

Notice the numbers running up the left hand side of the graph, covering the
y-axis.

 - using Python rpy2.
 - create charts using Quantmod, example code below

robjects.r['pdf'](file=filename)
robjects.r['chartSeries'](dataf, subset=subset, theme="white", TA=TA)
robjects.r['dev.off']()

Any ideas?
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