Android : Canvas Path using offset make to much copies

seems I have a problem to understand how offset works. When I use the code below it create me 5 arrowheads, but why? I create one and the use twice offset. So i thought i get 3 arrow heads.

public class legende extends View {

    private Paint paint;
    private Path arrowPath;

    public legende(Context context) {
        super(context);
        init();
    }

    public void init(){
        paint = new Paint();
        arrowPath = new Path();
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        int width = 1500;
        int height = 5000;
        setMeasuredDimension(width, height);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);


        arrowPath.moveTo(420, 300);
        arrowPath.lineTo(430, 300);
        arrowPath.lineTo(420, 310);
        arrowPath.lineTo(410, 300);
        arrowPath.close();
        canvas.drawPath(arrowPath, paint);


        arrowPath.offset(0,200);
        canvas.drawPath(arrowPath, paint);

        arrowPath.offset(0,380);
        canvas.drawPath(arrowPath, paint);
    }
}