GSTR 3B wrongly filled with ZERO values

I have filled the GSTR 3B For the month of Aug. For this month i have tax due of Rs 26666 and i made the payment and it is avilable in credit ledger. 

But when i see the value of GSR3B , the values of the head 3.1 Vaule of outward shows Zero. and i am not able to offset the payment credit avilable in credit ledger with liability. 

And i am not able to modity the GSTR3B and status shows FILED.. 

Kindly help me to solve this. 

B. Vasu 

9944452829.