Steve,
LANDESK handles patching in a different way than Microsoft does. Microsoft typically only looks at registry keys to detect if a patch has been installed. We have a dedicated team that takes the information from Microsoft about the actual files that cause the vulnerability and write a custom detection to find them. If you have those files then we install the patch if not we won't install the patch just for the sake of installing it.
Also you are searching by KB number in LANDESK, you need to be searching by bulletin number. For example KB2979578 falls under MS14-057, search that. If there isn't a corresponding bulletin number just search the number portion of the KB. ie. 2979578
Also I have seen the same thing with the Nessus Scanner. It was only detecting that the patch wasn't installed by a registry key, but the vulnerable files weren't present on the system which is why LANDESK doesn't show the system needing the patch.
If you would like a more in depth explanation please contact support.
Thanks