Maybe not all that odd.
Various bookies are taking bets on the timing of our departure from the EU. First time I checked, you could get 7/2 on Article 50 not being invoked before 2018 (ie the "2018 or later or not at all" option. Then it firmed to 3/1, then 5/2. Now 15/8. At this rate, it will soon be odds-on favourite.