Hmm... are you sure it will be like this throughout the season? But Real Madrid still has gaps in its defense, and this time many people believe in Xabi... maybe we can say that this is just the beginning, yeah, that's normal, but the defeat has damaged the confidence of many people.
We just have to wait for the season to start to see how Real Madrid will perform throughout the season against Barcelona.
There are many reasons for such a thing
The new manager, Alonso, has proven to be good, but it is not the same to lead Bayer, where not much is expected, and Real, where managers suffer the greatest pressure.
In the team, they have superstars who are not known for always submitting to the team. Most often, they are more ballast than advantage, and the best example of that is PSG, which started to play well when they got rid of the 'big' names.
There are no more experienced players, leaders of the game like Modric, Kroos, and I am not convinced that Bellingham is of their caliber. At least not yet.