The "First Registered" date changes in the computer details page when the agent cache is rebuilt without uninstalling the agent software
"First Registered" is the date and time that the computer first registered with its server. In the event of a cache corruption/cache rebuild the agent's registration count is reset to 0 on the App Control Server.
Defect EP-19397 will fix the issue, so that the "First Registered" date and time are not reset on the App Control Server when an agent cache rebuild takes place.
Carbon Black App Control Agent had to rebuild its primary database cache and now has to re-initialize. FullRestores[2] BackupRestores[7] LastPrimaryCreated[3/20/2021 6:56:50 PM]