I am in my third day of creating my first WordPress site, I am using the Twenty Twelve theme. I created 20 categories including some child categories. When I added the first post assigned to a child category, the category list on the site page showed an error: the names of the parent category and the child category are stacked one on top of the other. This continued when I added a post assigned to the parent category.
Incidentally, or not, I noticed on the Edit Post page, in the Categories pane, the list correctly shows the hierarchy for some posts but not for others. For the posts that are assigned to a category other than the problematic parent or child category, the list of categories correctly shows the parent category with its four children: the children are indented under the parent. For the posts that are assigned to either the problematic parent or child category, the list of categories incorrectly shows the hierarchy: in one case, which is assigned to the parent, the parent is separated from its children and the children are not indented; in the other case, which is assigned to a child category, that child is presented without indention and is separated from the rest of its hierarchy.
I am hoping y'all know how to show child categories indented on their own line!