Currently when you rebuild machines via SCCM or no doubt manually and you have an auto deployment setup of the webroot client on your domain or estate the GSM console adds a duplicate of the machine.
This causes a lot of administration to remove duplicate records within the GSM console, although you can run a powershell script to find all duplicates (see here - https://community.webroot.com/t5/Unity-API-forum/PowerShell-script-to-locate-duplicate-computers-in-GSM-v2/td-p/309644
You cannot stop this happening. Webroot need to allow a single unique identifer to either be selected or used from the offset. Ideally by MAC address as this is unique to every different client.
Without this feature the product doesn't really stand up in the enterprise marker as it should due to the possibilty of duplicates that would be charged for if you do not put in some administration time each week or month.