GST 9 Table 8A document details mismatched with GST 9 Table 8A auto populated amount

Dear All

I downloaded Table 8A document details from GST 9 FY 19-20 and found 72 lac in CGST/SGST but in GSTR 9 return table 8A auto populated amount showing 66 lac in CGST/SGST.....i reconciliation with my book some credits already ignored in table 8A and i considers table 8A after credit/ debit note, amendment and ITC not available.

example

GSTR 2A showing total ITC Rs.100

table 8A document details which downloaded from GSTR 9 showing total  80 after disallowed some ITC

and GSTR 9 Auto populated amount in Table 8A showing Rs.60.................why its not matched with Table 8A downloaded details with auto populated amount.

any one please help me.....