I also have noticed big drops, MOM game rating 9 19yo GK 120% even after the second game with a 6-0 win their gains were poor.
Three players in the last game also played in the first only 1 skill point each.
Striker in second game injured after 50min gets 3 skill points, 1 from the first game, crazy! man.

Maybe there has been some changes made to slow development down, to many messing with the system?.