Hello.
Since I also have questions regarding the genre category, I thought I'd rather post in this topic than start a new one.
Either I am extremely stupid and just can't figure out how this genre category thing is supposed to work, or it's somehow broken for me.
I have the Thumbnail Browser set to display the Genres, sort by Name, and group by Genre Category. I want to achieve a look that for example would have a genre category named 'Vocal' and have 'Female Singer' and 'Male Singer' under this category to look something like:
Vocal Female Singer
Male Singer
I already set the genre tags in my files like this:


I started from scratch in the genre category editor in order to try and understand how it's supposed to work, so as a test I have it looking like this:


But instead of looking like how I want it to, it looks like this:

I get the 'Unknown Genre Category' part since I didn't specify any categories for those genres, but where from hell does it get that 'Acoustic', 'Cover Song' and 'Rapcore' is supposed to go under the 'Vocal' category? And why doesn't it put 'Female Singer' under there? What am I missing?