I have also observed that Real Madrid performance in Champions League is usually different from their La Liga matches maybe this should be due to the Anceloti influence who is gifted in the Champions League and the only coach to have won the champions league five times. This year they are still a big threat for any team as they will be playing to defend the title. They might have started badly with their La Liga but they have a fast way of putting their house in order to confront any opponent. Most definitely they will regain the consistency they are known for and will give Barcelona a big fight as usual.
La Liga and the Champions League will always be important for Ancelotti. But the Champions League always has great prestige for Madrid. They always perform great in the Champions League. Ancelotti always has a strong strategy for matches against strong teams in the Champions League. Madrid has a strength that no other team has in the Champions League. It is their champion mentality that I think they maintain in every Champions League match they play. It is like saying that they are the champions.
Champions League matches are always different, every club will try to impress because it's the most prestigious competition, while for LaLiga it's important but they can catch up when they're behind. I believe Real Madrid can get back on level terms later in LaLiga.
I've never doubted Real Madrid in the Champions League and it's true that they have a winning mentality that other clubs don't have, the players carry a bit more ambition in UCL matches even when last season they were a goal down to Bayern Munich but Real Madrid could turn it around to win.