Lost cell spells, the choice of Pyromania of Italica. (Dark Souls 3)

I learned Pyromania of Italica (there are two spells - an area with lava and pillars of fire with lava) and when I insert in one of the cells of the spells one of these pyromancy, all the other cells of the spells are lost until the removed from the cell, Pyromania of Italica and if the other cells already something is, Pyromania of Italica in the selection menu becomes unavailable. What's wrong, and how to fix it?
Thank you.