How about a clean uninstall of VS and let epo reinstall it?
i have quite a few machines i'm working through where there is goofy sync issues like that.
The MA status screen pulls this information from
HKLM-Software-Network Associates-ePolicy Orchestrator-Application Plugins-Viruscan8700
REG_SZ = EngineVersion
So odds are this key is not updated.
The VSE plugin should be updated automatically when the product updates. And the plugin should pull the value directly from the directory path of the Engine (and Dats).
So with that said, it is most likely that the engine is not completely installed, or there are mis-match files in the directory.
Using the Full Superdat Engine install with a /F switch, would force the engine to reinstall and should correct this issue. But if you are seeing this issue on more than say 1 or 2 machines, you should collect MERs and open a tick with McAfee support, to determine if there is another VSE issue in your environment.