I been having problems with learning new abilities in the game, since early versions up until the last one. In my runs I usually go wind/water and then neather magic, but whenever I learn neather abilities they don't show up and I can use them. I already tried disabling old spells or moving them up in the menu, but nothing works. This happened both in the android and pc versions of the game and with every element. Aside from that the game is looking amazing as always :)
It's possible you need to learn attunement first. Every 10 levels you can learn attunement which allows you to learn a new magic style. For instance, I'm a wind mage but if I want to branch to water or nether, I will need to learn attunement first. However, I'm just a player, not the dev. Cryswar might have more info for you!
I remember in early versions the attunement were traits, but now I think they are granted automatically when you complete the training for the elements. Regardless thank you for pointing that out, I checked the game and I do have attuned with neather magic but still the spells don't show up. Also I never seen anyone with the same problem so hopefully it's not a major bug.