I played around with this some more.  The fix was pretty easy.. just
add one line resultchart.hideData().  At least this worked for me.

        public function appendInterval(column:String):void
        {
                resultchart.hideData();
                var series:ColumnSeries = new ColumnSeries() ;
                series.xField = 'label' ;
                series.yField = column ;
                series.setStyle("showDataEffect", slideIn);
                series.setStyle("hideDataEffect", slideOut);
                var currentSeries:Array = resultchart.series;
                currentSeries.push(series) ;
                resultchart.series = currentSeries ;
        }

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