I just upgraded to the Diviners Deck and got rid of the starter deck. I have all my same spells, but it seems only the spells that are stuck on that bottom row are the ones I can use. I have tried everything, what did I do wrong and how can I fixed it!!
You need to go into your backpack ("B" key) and click on the deck tab. Then double-click the deck listed in order to equip the deck for use. I closed fist icon will appear to the left of the deck name. This shows that the deck is now equipped.