From: https://www.redhat.com/archives/rhn-users/2006-March/msg00057.html

"I am having problems with Red hat Network.  We currently have 28 active
Management subscriptions (mostly RHEL 3AS and a few RHEL 4AS).  For quite awhile
we've had the following problem:

"Whenever we select packages (via the web interface) to install on one
particular system, these same packages will be listed to be installed on any
other system I attempt to manage (via the web interface).  For example, if I
choose to update tar on serverA, when I go to update say CUPS on serverB, tar
shows up as a package to update. 

"I have double checked and we've not using any system groupings or anything like
that.  Any reason why this would occur.  I'd really appreciate any
insight/fixes.  Thanks in advance....."

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I was able to reproduce using the following steps:

1) Click on "Errata" tab for server A. Select all errata available to apply and
apply them.

2) Click on "Errata" tab for server B. If server B has any unapplied errata that
intersects with server A's (previously unapplied) errata, those errata will be
pre-checked on server B's errata tab.

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A 'workaround' for anyone affected by this issue is when you get to server B's
errata tab, hit the "Unselect All" button at the bottom right of the list of
errata first. This should clear any errata selected from the previous system.