OUTPUT SHOWN MORE GSTR3B BUT GSTR1 IS OK

if no adjustment of excess output paid in FY 2017-18 is made in FY 2018-19, then you can go for refund by filing refund application for excess paid for the month. due date is two years from end of month in which excess output is paid.

There is nothing described in act or Section about such situations.

Kindly refer The technical Guide on Annual return released by ICAI.

In GSTR 9 the figures in table 4 are autopopulated from GSTR 1 , which is tally from your books of Accounts, So no changes required in table 4 , But in table 9 , the output liability is autopopulated from GSTR 3B , hence change that output Liability to as per the liability declared in Table 4.