Sometimes, if you leave the wings open and then open and close the menu, you get some very weird visual bugs that you can't seem to remove without restarting your game.

This bug happened to me multiple times while leaving my "Expressions" wing open, but It's pretty hard to replicate. I've only seen it twice so far (yes, that main menu in the first image has 4 or 5 different wings at varying transparency!).

(It also has a tendency to lag your game pretty hard when doing this)