I don't know why it's always a balance with teams that score too many goals, I mean their back seems to be always open and they concede alot which is not very good although it brings out the very best because it's like competition when they concede more goals but if they find the balance to have a strong defense line they would be far above most of the teams in la Liga even the giant Real Madrid.
Well, yeah, it turns out that both Real Madrid and Barcelona experienced it worse. The number of goals they conceded was 39 and 38, which is much more than Atletico Madrid who only conceded 30 goals and also Athletic Club who only conceded 26 goals. So, defense is indeed homework for both clubs.