Backup Shell Request wrong (LatestFullBackupTime) ? MailboxCopyStatus & MailboxDatabase

Hi All

There are two Shell Commands to check the LatestFullBackupTime

Get-MailboxDatabaseCopyStatus | ft Name,LatestFullbackupTime,Status 

 Name, LastFullBackup   

DB01 14.12.2012 23:56:53  Mounted

&

Get-MailboxDatabase -Status |ft name,Last

 Name, LastFullBackup            

DB01 15.12.2012 00:56:53    

Does someone know why ?

Thanks