The Discovered Unreviewed Software page shows software components that can't actually be reviewed/managed. When looking at the properties of the problem software it shows Attributes: Readonly. The read-only software may have been created by running software inventory on Linux servers.
8.0 HF4
The behavior of the Discovered Unreviewed Software page was changed in 8.0 HF4 to improve performance but now no longer hides read-only software.
Add custom filter criteria to the Discovered Unreviewed Software page to hide read-only software.