Please see this Technote - http://seer.entsupport.symantec.com/docs/273270.htm
Basically the table is showing you what has been archived AND marked as secured (backed up) with the "Total Items" column, and the "Items Awaiting Backup" is showing what items have not yet been secured.
With EV8 we now use the term "secured" with backed-up, as the storage and SIS has been changed. With the advent of improved SIS, a .DVS file is now only recognised as being secured when all component parts (.DVSSP and .DVSCC) relating to the .DVS file have been secured (backed up) - finally marking the .DVS as secured.
It looks like you have a lot of items that are not secured. Check what backup type is configured for the partition (either Archive Attribute or "Secure Partition Notification) - check your backup is doing the right thing (either removing the archive bit or writing the .XML file) - EV needs to go into Backup Mode, then back out to trigger the post-backup process which will scan the items to confirm if they've been backed up or not - and you should then see this report decrease (you will need to refresh the screen as it's HTML and not dynamic)
Thanks
Mark