Eye Accessory glitch?

Theres a 60% Eye accessory for int that gives +1int, +1 m def.
The 100% eye accessory for int gives +1 int.
Shouldnt the 60% be giving +1 m attk?
Oh yeah, where can you get the 100%'s though?

why would a 60% be better then a (limited)100%?

~gacha