I have absolutely no clue why Real Madrid keeps getting these injuries, surely there must be something about the training they are doing, but also they have world stars, who all play for international games, so between league games, UCL, cup, club world cup, and then back to league, these players play like 60+ games a season which makes them injury prone and tired and the fatigue makes them injured easier.
Whatever is the reason, they have to find the problem at the root cause and fix it very quickly, because they can't afford to have a bad season. It's their first year with Mbappe, and fans are expecting a lot from them this season, if they fail to get anything, then it is going to be pretty tough to tell fans to calm down and wait for another year.