Tight does not affect the headline

The new layout is certainly more compact, but somehow that doesn't seem to apply to the headline.

            mpf.plot(stock,
                     type='candle',
                     volume=volume,
                     addplot=add_plots,
                     title=index_name + ' : ' + ticker + ' (' + datum + ')',
                     ylabel='Kurs',
                     ylabel_lower='Volumen',
                     style='yahoo',
                     figscale=3.0,
                     savefig=save,
                     tight_layout=True,
                     closefig=True)