Gstr4 late fees

I m filling GSTR4 of July-Sep 2017 but portal return shows liability of Late Fess payable Rs.6,800(SGST+CGST) and Interest Rs. 772. As per GST rule there is no LF for quater July-Sep 2017, and as per law the maximum limit of LF cannot exceed Rs. 5,000/- whereas the portal shows 6800/-. How is this possible. How shoukd I file the return now??