I guessed what the matter was - maybe the fact that the referees helped Barcelona in the first round had a decisive impact on the bookmakers' opinion 
The fact that Real conceded zero goals is of little significance compared to a team that can count on help from the referee. I won't say that I believe in this conspiracy theory, but maybe many do and it changes the cash flow of bets, and bookmakers only reflect this.
The fact that Real conceded zero goals is of little significance compared to a team that can count on help from the referee. I won't say that I believe in this conspiracy theory, but maybe many do and it changes the cash flow of bets, and bookmakers only reflect this.How about the penalty Madrid received in the first match, when it was Mbappe who stepped on the player's leg?
How about the first Madrid's goal against Oviedo that should have been ruled off for a foul before the goal?
You can't pick out where the referee was favourable to your rival and pretend not to see how the referee was favourable to your own team.
The first red card in the Mallorca game was undeserved, but Barcelona were already 2-0 up before that red card, and they were controlling the game well, so you can't claim that they won because of the red card.
You're delirious. If a player makes a tackle, it is his fault if he gets under the foot of the player he is tackled under. It's a clear penalty, any unbiased fan will confirm that. When Rafinha kicks a Mallorca player from behind (without touching the ball at all) but doesn't get a red card, that's a clear mistake.
In general, you are obviously biased, I am not even going to discuss this and other nonsense that I am sure you can write. Let's stop at the fact that I support Real, and you support Barcelona. You can also consider me biased.