I got up to Disk Level 3 and unlocked the Blinding Light spell. I then crafted 10 of them, and went into battle. After I won the level (happened to be level 180), it said I used the spell 4 times and I got 4 Disk Points. Shouldn't I have gotten 16 Disk Points? Also, after the battle I went to my inventory and saw that I still had 9 of those spells left, even though I used it 4 times in that battle - is that correct?