I just upgraded to 2.6+ but this actually happened when we upgraded to 2.5. For some reason the course listing page collapses all the categories and only shows the top ones. Before, it showed a deeper level.
This is super annoying..I'm almost positive it's from the changes when I upgraded to 2.5. I am using a custom theme but I have confirmed that the core themes are the same way. I've tried looking in the settings but I can't find anything.
Any help would be great! Thanks!