Although Government has waived the late fee over and above the Rs.25 each vide (notification no 64/2017 dt 15-11-2017) but still while filling the GSTR 3B for the month of October after due date i.e. 20th Oct 2017 , the Portal is automatically generating late fees of Rs 100 each instead of Rs.25 each.
This problem of GSTN Computing 100 Rs. as Late Fee can be resolved by *clearing the cache of your browser*.
Follow the below steps to clear the cache of your browser:-