I created two custom taxonomies. I created them using identical code and then finding and replacing the "name" with "name2".
I've then looked at the post type page and there are two tag boxes to choose tags in.
However, one div is called "namediv" and the other is "tagdiv-name2".
This would suggest that one is a category and one is a taxonomy.
I know that categories are kind of a taxonomy, but why is my custom taxonomy taking the form of a category?