[Solved]-Highcharts pie chart dynamically changes size-Highcharts

You will have to set a fixed size for the pie chart. Can be a percentage or a pixel value. For example:

plotOptions: {
        pie: {
            size: 100
        }
    },

See this fiddle from the API http://jsfiddle.net/gh/get/jquery/1.7.2/highslide-software/highcharts.com/tree/master/samples/highcharts/plotoptions/pie-size/