This probably isn't new. The book is BetOnline. I think I remember reading something about it a long time ago, but hadn't been using them for a couple seasons. Even so the way they do it sucks.
The other leg covered is +2.5 to +8.5. It clearly shows -110 as the odds. I almost hit confirm too, but after entering the bet size it gave me -120 just in the payouts, but the terms don't show this. That's going to catch some people.