I have a stacked column chart. The bars are set at 75%.

var defaultGraphOptions = {
    legend: { position: 'top', maxLines: 2 },
    title: '',
    height:400,
    width:800,
    chartArea: {left:"15%",top:40,width:"90%",height:"80%"},
    isStacked: true,
    bar: { groupWidth: '75%' },
    hAxis: { title:"", titleTextStyle: { bold: true, italic: false, }, 
slantedText: false, viewWindow: { min: [5, 0, 0], max:[20, 0, 0]}},
    vAxis: { title:"", textPosition:"out", titleTextStyle: { bold: true, 
italic: false, }, viewWindow: { min: 0, }, },
    colors: [],
};

 The bars almost always show correctly 

<https://lh3.googleusercontent.com/-H2LAke4FM88/V0axjIfsSfI/AAAAAAABPNk/q_h3oyfNGQILPZhUTIREsIwBwxtRDMaiACLcB/s1600/ScreenShot060.png>

 However, every so often the bars appear very narrow.

<https://lh3.googleusercontent.com/-m2_2dVfzICs/V0a0yzLyvvI/AAAAAAABPN4/10slqo90SwYIFSjPoDElvNBbbjSFN9EtQCLcB/s1600/ScreenShot061.png>


 The default options are set once when the application starts and the 
"faulty" graph may suddenly show several times after viewing the "correct" 
graph many times with different data and then revert to normal.


Any ideas?



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