NewsBlur Android only shows the subfolders but not parent folders.
It should show parent folders if the parent folder has top-level feeds. What does the web look like for you?
The web version works fine.
But I don’t have top-level subscription under the parent folder.
According to this thread, that is how the app was designed in order to save space. I just looked at my app and confirmed that if the top-level folder doesn’t have any feeds in it (only contains subfolders), it does not appear at all in the android app. If the top-level folder has feeds and folders, it will show up (always under all feeds or with unread items as applicable).