Primary and Standby Database archive log sequence issue.

Hello,

On my primary database,

SQL> SELECT SEQUENCE#, FIRST_TIME, NEXT_TIME FROM V$ARCHIVED_LOG ORDER BY SEQUENCE#;

SEQUENCE# FIRST_TIM NEXT_TIME

---------- --------- ---------

        90 15-MAY-14 16-MAY-14

        90 15-MAY-14 16-MAY-14

        91 16-MAY-14 16-MAY-14

        91 16-MAY-14 16-MAY-14

        92 16-MAY-14 16-MAY-14

        92 16-MAY-14 16-MAY-14

172 rows selected.

SQL>

You could see the above output of select statement is giving duplicate  SEQUENCE# (like 90,90 | 91,91) etc.

The issue is only exist on primary database.

Please suggest action for the above issue.

Regards,