multiple, multisite installations on one vhost. possibly and htaccess issue

I have one multisite already installed and its in the root directory /html/ and i have domain mapping going there and of course the main domain is pointed to that directory this install uses a subdirectory format . I want to install a multisite with subdomain format in /html/other/ i pointed the domain to this directory, and have the wildcard set up properly, and when you go to the site other.com it goes to the correct place , but when you visit a subdomain 123.other.com it takes you to the main installation html.com. Any ideas? is this a .htaccess issue? Thanks for your time.
DD