My Book Live Backup Timestamp is not getting updated

I am using Time Machine on my iMac to backup my 2 drives.  Time Machine completes the hourly backup with no reported problems but the time stamp on the My Book Live does not get updated.  For instance, Time Machine currently shows that my last backup completed at 7:43 PM this evening (8/21/2012).  However, the My Book Live time stamp is showing Sat 04 Aug 2012 11:31:45 PM.  I am running firmware version “MyBookLive 02.11.09-053”.  Is anyone else experiencing this problem?

This is strange

was august 4 by the first day the backup was done?