I am running Ubuntu GNOME 15.10 with GNOME 3.18, however when going into the Details section of the gnome-control-center it tells me just under the logo that I am running 16.04, though it then below says Ubuntu 15.10 64-bit (I have put a black box on the some of the information that I do not wish to be shown):

This is very strange, so I am wondering why this is the case? I am not running 16.04, so why does it say that I am?

Information Update:

The output of lsb_release -a is:

No LSB modules are available.

Distributor ID: Ubuntu

Description:    Ubuntu 15.10

Release:    15.10

Codename:   wily

And the output of apt-cache policy base-files gnome-shell is:

base-files:

  Installed: 7.2ubuntu11

  Candidate: 7.2ubuntu11

  Version table:

 *** 7.2ubuntu11 0

        500 http://archive.ubuntu.com/ubuntu/ wily/main amd64 Packages

        100 /var/lib/dpkg/status



gnome-shell:

  Installed: 3.18.2-0ubuntu2~wily1

  Candidate: 3.18.2-0ubuntu2~wily1

  Version table:

 *** 3.18.2-0ubuntu2~wily1 0

        500 http://ppa.launchpad.net/gnome3-team/gnome3-staging/ubuntu/ wily/main amd64 Packages

        100 /var/lib/dpkg/status

     3.16.4-0ubuntu1 0

        500 http://archive.ubuntu.com/ubuntu/ wily/universe amd64 Packages

     3.16.3-1ubuntu6+wily1 0

        500 http://ppa.launchpad.net/gnome3-team/gnome3/ubuntu/ wily/main amd64 Packages