double information in motd

[Alvin]

If I log in remotely, some servers show double statistics for apt, like this:

	0 packages can be updated.
	0 updates are security updates.

	0 packages can be updated.
	0 updates are security updates.

/var/run/motd contains the duplicate information.
/usr/lib/update-notifier/update-motd-updates-available contains the command 
that produces this output (/usr/lib/update-notifier/apt-check --human-
readable)

Any idea why this output appears twice?

-- 
Alvin