Missing security patches

Howdy,

We use Ivanti Protect for our servers, and have done so for 3 years (or more). Separately, we use AlienVault to monitor systems for breaches and vulnerabilities, etc. AlienVault is showing a variety of missing security patches for a number of the servers getting patched via Ivanti.

We are not using a remote agent for said servers.

Patches are installed monthly and for most servers, are auto deployed after download with forced reboot.

Our Ivanti is the latest version.

Some of the patches shown as missing in AlienVault are recent, e.g., 2 or 3 months old.

I use WUScan (canned) as the scan template.

What am I missing? How is it that important security patches are not showing up in the scans to begin with?

Thanks.