Does seem like an 'honest' bug. I did what the OP did (except I checked the middle option), and when you then look at the source of the page, it includes
I had never read that! Charming. The punchline is, it's actually Heinlein's razor. Which makes perfect sense.
(yes the wiki refers to a Robert Hanlon of Scranton, PA. This is probably only amusing if you're from America and know that Scranton is the archetypal funny place to be from)
I mean, if they're going to do everything in ugly inline CSS, it doesn't surprise me that they didn't check to see whether or not the user selection of the subscription reset upon reload.