Why did i get a refund check from national shared service center?

You received a refund check from the National Shared Service Center likely because you overpaid for a service or benefit, or there was an adjustment made to your account that resulted in a credit. This could be related to various transactions, such as health benefits, retirement deductions, or other services managed by the center. It’s best to review any accompanying documentation or contact their customer service for specific details regarding your refund.