Difference in FSC curve tight mask and corrected

Hi,
I am getting difference in FSC curve in tight and autocorrected mask.It is always showing more resolution in tight mask FSC as compared to corrected one.Can someone please help me is it possible to achieve that resolution or improve mask?
I have attached the images of FSC.
P3_J139_fsc_iteration_007_after_fsc_mask_auto_tightening P3_J139_fsc_iteration_007

Thankyou,

Regards,
Priyanka