It is because you were using a lot of offers. Try to do that now.
With 19 players in the squad playing in 3 competitions, no wonder why you depended so much on offers for packs. 1-2 excessive injuries periods or a few periods where you needed to use full pressing for a few matches and you will be back here complaining that most of your players are in poor condition and that you don't have enough packs to boost their conditions. Also, it is evident that you will have more trouble boosting the bonuses from training with 19 eligible squad players only. So, it is your fault if you decide to stick with less squad players than the maximum allowed and depend more on offers for green packs.
Do you think that I have proposed a 25-player squad just like that?