It's buggy... all the options are there, they just aren't lined up right with what you select.
For example, I like Dark Milk - Less Opaque... but selecting that option gives me fully transparent. However, if I select Milk Glass - Clear, I get the black transparent bar, as if I selected Dark Milk - Less Opaque.
My suggestion... try the different options, even if it doesn't line up correctly. I'm sure it'll be updated soon to fix this bug.