Hello @Dylan. Thank you for your reply.
I understand how genres work, at least as far as your explanation goes. But something weird happens at times where unmarking a genre will add other genres for some reason. I’ve seen this a lot with “Pop/Rock” and “Album rock”.
To show continue with my previous example, these are the genres that show in my Pink Floyd’s artist page:
I unmark “Album rock” and save. This is what I get:
The expected happens: album rock is no longer there.
But unexpected things happen too: “Mixed media” and “Pop/rock” are now showing up
Let me underline that I did not add “mixed media” and “pop/rock”. I merely unchecked “Album rock”
EDIT: To answer the questions at the end of your post. I am applying changes as you explain, but when I unmark specific genres, aside from those being removed, others are added. And yes, I am experiencing this with many other artists. If it helps, I included an example with the Beatles on this thread.