Plate chest bug?

Chestplate of Unspoken Truths:
Chest Plate
2641 Armor
+123 Stamina
+123 Intellect
Red Socket
Yellow Socket
Socket Bonus: +7 Spell Power
Durability 165 / 165
Requires Level 80
Item Level 264
Equip: Restores 100 mana per 5 sec.
Equip: Increases spell power by 171.
Equip: Improves critical strike rating by 108.

Mail of the Geyser:
Chest Mail
1477 Armor
+123 Stamina
+123 Intellect
Red Socket
Yellow Socket
Socket Bonus: +7 Spell Power
Durability 140 / 140
Requires Level 80
Item Level 264
Equip: Restores 46 mana per 5 sec.
Equip: Increases spell power by 171.
Equip: Improves critical strike rating by 108.

100mp5 versus 46mp5. Really?

I know Healadins probably won't wear it since it's crit/mp5, but how comes the plate version has 54 more mp5 than the mail armor?

Also, in before GC "I love data mining day".