Why does samba packages get installed in Red Hat Enterprise Linux 6 even if those are mentioned with minus in %packages section?

Issue

• Why does samba packages get installed in Red Hat Enterprise Linux 6 even if those are mentioned with minus in %packages section?
• It has explicitly mentioned not to install samba packages in kickstart file's section as follows, still those get installed.

%packages
@additional-devel
@base
@client-mgmt-tools
@compat-libraries
@console-internet
@compat-libraries
@core
@debugging
@desktop-platform
@desktop-platform-devel
@development
@directory-client
@ftp-server
@hardware-monitoring
@java-platform
@large-systems
@legacy-unix
@legacy-x
@mysql-client
@nfs-file-server
@network-file-system-client
@network-server
@performance
@perl-runtime
@postgresql-client
@system-management-snmp
@security-tools
@server-platform
@server-platform-devel
@server-policy
@system-admin-tools
@system-management-snmp
@graphics
@web-server
@mail-server
@x11
ksh
libuuid.i686
freetype.i686
libSM.i686
libICE.i686
libXi.i686
libX11.i686
libXext.i686
libxcb.i686
libXau.i686
libXrender.i686
libXrandr.i686
libXfixes.i686
libXcursor.i686
fontconfig.i686
expat.i686
zlib.i686
libstdc++.i686
compat-libstdc++-33.i686
xorg-x11-apps.x86_64
libXaw.x86_64
libaio-devel.x86_64
unixODBC
unixODBC-devel
lm_sensors.x86_64
dos2unix.x86_64
unix2dos.x86_64
xterm.x86_64
-subscription-manager
-subscription-manager-firstboot
-subscription-manager-gnome
-samba*
-samba-winbind-clients.x86_64
-samba4-libs.x86_64
-samba-winbind.x86_64
-samba-common.x86_64
%end