User A (locked) is being audited when expdp is run by user B

IBM AIX on POWER S 7.1 --- After upgrade from 12.1 to 12.2

2 users in question-- A and B

  A is locked (full audit)

  B --runs the export from different schema ( not audited)

 All the privileges user B has is connect , resource , import full db , export full db

SQL> CREATE USER "B" identified by "Test#2021"

DEFAULT TABLESPACE "USERS"

TEMPORARY TABLESPACE "TEMP"; 2 3

User created.

SQL> grant "RESOURCE","DATAPUMP_EXP_FULL_DATABASE","CONNECT" to B;

 When the export is run -- ./expdp parfile=/home/oracle/backup_test.par

   we see in the audit logs generated with the username A  

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Trying to understand why when expdp is run --it is pulling the Username as A