So 7 Investment limit for Magic category things applies, plus you have 5 Spell Packs listed with only 4 Magic Investment. Basically, you're at 13/14 points so just invest one more to 5 in Magic to keep the current spell packs. With commutable points though, you're only allowed to purchase 2 more packs from within the Magic Category (Curses and Spell Point Buy), the others will have to be invested in Artificer because you're already at 7 Dex. @Koyote