We are up to date! We list a lot of the Software Distribution items under their Applicable OS instead of the product they are for. I see Distributions Server information all the way up to 10/13/2015 when searching in View > Patches. Search for APSB15-25, the Qnumbers that end with N are Software Distribution items. I would suggest scanning one of these machines with a Scan Template with Software Distribution enable to see what is missing. The bulletin title column will tell you more about what the missing item is for, here is an example:
All the missing patches are Software Distribution items. (full installers)
You will see the product is the OS for all items.
I highlighted the latest Flash Player installer.
The best way to see what the installer really is would be to download it.
Let me know if you have any questions,