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MAX(SEQUENCE#) from V$ARCHIVED_LOG is showing a wrong sequence#


Dear Experts, 

   We are working on DataGuard setup in 11.2.0.2 (Windows 2008) with FSFO. 

   Due to a crash in Primary DB, observer failed over the database to the standby. Before the failover Max(sequence#) from v$archived_Log is 18926. 

   Immediately within 10 m ins after the failover, we reinstated the primary to function as secondsry and in the very next downtime we switchover the configuration. I see a problem right from then on though there is no problem with the Recovery process at standby. 

  The below is difference I see

At the standby site, I see the max(sequence#) as  18926, where as the applying log is 1653.

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