Not sure which layout you're using but if you use the same layout as the homepage of our demo site, there is not much space to show 4 columns in this module. When changing to 4 cols, the width of each item will be reduced.
You can open the file: root/templates/ja_focus/html/mod_articles_category/news-6.php
Change line 32:
<div class="col-sm-4 col">
<div class="col-sm-3 col">