Taxonomy lists only display small letters

While using

<ul id="all-categories">
  {{ range $name, $taxonomy := .Site.Taxonomies.categories }}
    <li><a href="/category/{{ $name | urlize }}">{{ $name }}</a></li>
  {{ end }}

the list that gets displayed only shows categories with all small letters, even though that they are defined like this in the front matter:

categories = [ "USA", "Update", "NFL" ]

What am I missing? Thanks!

Take a look at this thread.