InvientCharts, do not distribute bars evenly

Hi,

I'm going to add big number of series to a bar chart, but by adding more bars (series), they are becoming more compact and not distributed through the whole x-axis. Do you have any idea ?

while( iter.hasNext() )
	    {
		Object [] rec = ( Object [] ) iter.next();
		String sdpid = ( String ) rec[ 0 ];
		int fr = bigDec2Int( rec[ 1 ], 0 );
		int ii = bigDec2Int( rec[ 2 ], 0 );
		int fn = bigDec2Int( rec[ 3 ], 0 );
		
		seriesData = new XYSeries( sdpid + " FR" );
		seriesData.setSeriesPoints( getPoints( seriesData, fr ) );
		invChart.addSeries( seriesData );
		
		seriesData = new XYSeries( sdpid + " II" );
		seriesData.setSeriesPoints( getPoints( seriesData, ii ) );
		invChart.addSeries( seriesData );

	    }