I have noticed for awhile a couple different issues with WSUS.
1. Servers always seem to report 99% of updates installed. Yet if you go to those servers and check for updates, it shows none available.
2. If you check for updates online (instead of WSUS), it almost always reports several updates but when you check for updates via WSUS, it shows not available.. almost like WSUS is a month behind what is on Windows Update. I checked the syncs and it successfully syncs each night and I have every Windows Server 2008r2 update category checked.
Any advice? it seems to be rather common from conversations I have had with other engineers.