That sounds suspiciously like a caching problem on your server. o.O
So, all that's left to correct is a way to import the other sites into the multisite space that's been allocated for them. Normally, you go to Tools/Import, but for the secondary sites, that option isn't on the Dashboard for them.
Ah, on Multisite you have to install the plugin first :) Go to http://example.com/wp-admin/network/plugins.php - install the WordPress importer plugin. Network activate it. THEN it'll work :)