Yuffie didn't steal all of my materia

[Rantz]

Yuffie only steals a certain amount of materia (between 48 and 50, I think). If you have more than that amount, she will leave those. Her priority in materia is as follows:

Master Summon, Knights of the Round, Master Command, Master Magic, Bahamut ZERO, W-Summon, W-Magic, Mega-All, Counter, Typhon, Hades, Quadra Magic, Mime, Magic Counter, Ultima, Shield, Full Cure, Neo Bahamut, Phoenix, Enemy Skill, Double Cut, Slash-All, Exp Plus, Alexander, Kjata, Bahamut, W-Item, Contain, HP<->MP, Morph, Steal As Well, Added Cut, Final Attack, Manipulate, Sneak Attack, Added Effect, Comet, Elemental, Throw, Leviathan, HP Absorb, MP Absorb, Odin, MP Turbo, Titan, Ramuh, Deathblow, Ifrit, Gil Plus, Counter Attack, Shiva, Long Range, Pre-emptive, Chocobo Lure, Choco/Mog, Enemy Away, Luck Plus, Magic Plus, Speed Plus, Enemy Lure, All, HP Plus, MP Plus, Cover, Destruct, Gravity, Time, Barrier, Exit, Transform, Mystify, Seal, Revive, Earth, Poison, Sense, Steal, Heal, Restore, Lightning, Ice, Fire, Underwater.