The "none" forum has to do with Drupal's underlying system. Drupal supports a system called "taxonmy", which is essentially a list of categories. You can have multiple lists so that one list is for forums, another list is for events, so on and so forth.

When you make a post, the forum it goes to is just a category from the list of categories that I defined for forum posts. The reason why you saw "" was because I failed to check the box that said, "require all posts to have a term in this category". So it's fixed now.