You need to update the sites URL in the database. If you've just replicated the database to the new site(s), then the old URL is still in there so that's what WP will use to link to.
You will need to use phpmyAdmin, or whatever DB tool your hosts provide, to update the values for 'siteurl' in the 'wp_options' tables on all of the additional databases. This will get you started.
Another thing that you will need is to update all of the hard-coded links in your posts, widgets, etc on each new site. I use this tool for that, and it works very well when you follow the instructions.
