In Manage->Devices, select the server (one that is missing from non-compliance report) and check if "Software Inventory" information displayed in "Details" tab.
If it is displayed, what are the components listed ?
In Manage->System Updates, under Advanced Settings, toggle Enable or Disable downgrades once. Wait for 10 minutes for the compliance report to get updated and check if the missing server shows up.
Thanks,
Raj Shresta