I believe that the odds will change in no time. The odd is given based on the players on ground that will play the match and many more but I still don't see it as what one should use to make his decisions on which club to bet on. Madrid is more stable in UCL, and they don't mess up with their matches. The problem is their defense, Courtois is not going to be on the goal post tomorrow which can be an advantage to the host.
Big odds are visual way of marketing casino and that's what stake is doing. If you want to see more about this odd changes, whenever there is high interest in a particular game like the way Arsenal and Real Madrid are coming, some casino gives big odd in anticipation for people to come bets on their platform because other betting platforms will be having them, to snatch players, they use big odds to attract players and it reduce as the event comes to time.
This particular screenshot was share like 3 days ago, tomorrow is the day of the match. If you check that game today, the odd would have decrease but if it happen that there are no interest from bettors, the can even increase it further and then change it immediately they amass huge number on that particular game, that's how bookmakers play their book and put the casino interest before anyone. The day of the game, you might see that reduced to 1.2 odd for Real Madrid.