The identity column of the destination table does not contain the same identity values as the source table after you use SQL Server Management Studio to import data or to export data in Microsoft SQL Server 2005
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Source: Knowledge Base
Product: Microsoft SQL Server 2005 Enterprise Edition, SQL Server 2005 Standard Edition & SQL Server 2005 Enterprise X64 Edition
Notification Contents: New and Major Modifications
The identity column of the destination table does not contain the same identity values as the source table after you use SQL Server Management Studio to import data or to export data in Microsoft SQL Server 2005
http://support.microsoft.com/kb/952111/en-US