apt/dselect anomaly

[Marty <martyb@ix.netcom.com>]

I usually keep current with the Debian archive using apt-get.  Sometimes, 
however, I install programs using dselect.

After upgrading to the latest Debian archive using apt-get update/upgrade,
I got the following message while running dselect:

The following packages will be upgraded:
  openssh-client openssh-server

It happened on two different similarly configured machines.

I'm pretty sure this has never happened to me before.  I have always thought 
that upgrading using either apt-get or dselect (using the apt method) were 
equivalent, at least with respect to staying current with the archive.

Am I missing something major?  Thanks for any illumination.