Just noticed an odd thing about this Level 110 spell. In my spell book, it's listed as Prismatic Chaos VIII, yet in my recipe book or on the broker, it's listed as PC IX. Everything is the same, damage, etc., except when it's in your spell book or on your hotbar, it's listed as VIII. And yes, my spell book is set to only show highest level of spell. How odd is that?
Do a list all spells, then flip thru and see if it is listed... Sometimes the 'show highest level' really shows the 'strongest version' of the spell.. and if your VIII is stronger then your IX version, it will show the VIII version.
Hit your K key to pull up spellbook, then look near bottom for a "Sort" button. Little dialogue box will pop up. You can figure it out from there, I'm sure.