two different network admin urls?

Wordpress multisite 3.3.2

I notice that I have two different network admin urls for 1 website. Each url displays a different set of plugins as being installed.

Is this normal wordpress behaviour? And if not, what should I do to fix it?

These are the urls

http://my-site.org/wp-admin/network/

and

http://my-site.org/network/wp-admin