I have created 2 test forums, but when I go to Admin Control Panel -> Forums page I cannot see any forums listed. The same is true for categories. But when I go to Groups or Users, I can see the listing. However, When I click on permissions link on a group that I have created, the categories and forums are listed on the Group Permissions Control page !!
I'm not sure why you don't see them on the Forums or Category pages when logged in as Admin, but in order to be seen on the public pages, you would have to give the right permissions groups access to those new forums.
Try deleting those and creating them again with chosing groups that you wish to have read, write, access etc. (familiarize yourself with the groups).