GSTR 9 / Set Off

for 2017-18, As per accounts Our Tran Credit + ITC + GST Payment =2,06,20,484/=
We have utilised itc set off in 3b =1,80,03,959/=
Balns ITC c/f to 18/19 = 25,66,072/=
c/f supposed to be = 26,16,524/=
in this itself we have excess credit = 50,452/= i.e., we C/F less value than actuals
Now in GSTR 9 under set off shows still Tax Payable = 82,326/=
Even mathematically / Logically not tallyed
pls explain....