When rendering a Sparkline with this data set all of the maximum values (100 in this example) will be cutoff. This is only a problem when using the Resample option.
I am not sure the root of the problem, but I found that it can be worked around by changing line 227 of Sparkline_Line.php to:
$imageVCHandle = $this->CreateImageHandle($xVC + 1, $yVC + 1);
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