I suppose both primary and standby DB's are not in sync as below. Could you please check and confirm?
In primary
SQL> select max (sequence#) from v$archived_log; MAX(SEQUENCE#)
--------------------------------------------------------------------------------
44406
SQL> archive log list
Database log mode Archive Mode
Automatic archival Enabled
Archive destination /app/orcl10p/admin/ORCLP/arch
Oldest online log sequence 44405
Next log sequence to archive 44407
Current log sequence 44407
In standby
SQL> select max (sequence#) from v$archived_log; MAX(SEQUENCE#)
--------------
44377
SQL> archive log list
Database log mode Archive Mode
Automatic archival Enabled
Archive destination /app/orcl10p/admin/ORCLP/arch
Oldest online log sequence 44376
Next log sequence to archive 0
Current log sequence 44378
This is standalone DB.