When you view the Product Deployment page, ePO compares data from product events and properties to determine the product installation status. This action occurs for each system with the Product ID and version that is configured in the Product Deployment project.
 

ePO requires the Product Code for installation packages to be 12 characters in length. But, the Product Code for some versions of Drive encryption is only four characters in length. The number of characters prevent ePO from correctly reading the Product ID and version, when it queries the product information configured in the Product Deployment project.