Filipe Melo, if that is the case, I would suggest not opening the mobile app and play on the webversion for time being, as long they allow it still.
I like to train my youth players special abiities to make them more efficient and better price when I sell them.. therefor I had a couple of youth players assigned with special abilities. On the web version things still work as before, However if you watch the match on your mobile all your points are immediately auto-assigned so you wont be able to assign them to the SA.
So finish your SA players by playing web version only.....As soon mobile app is started , all points are gone( assisgned) instantly.
Hope this helps mate, goodluck.