On Deafening Critical, I think I found a typo. Help!

[Flynn Greywalker]

Deafening Critical (Combat, Critical)
Your critical hits cause enemies to lose their hearing.

Prerequisites: Critical Focus, base attack bonus +13.
Benefit: Whenever you score a critical hit against an opponent, the victim is permanently deafened. A successful Fortitude save reduces the deafness to 1 round. The DC of this Fortitude save is equal to 10 + your base attack bonus. This feat has no effect on deaf creatures. This deafness can be cured by heal, regeneration, remove deafness, or a similar ability.
Special: You can only apply the effects of one critical feat to a given critical hit unless you possess Critical Mastery.

This is how the feat reads. However, here is my question/concern. If an opponent is PERMANENTLY Deafened, how can a fortitude save reduce the effect by a round. Isn't the effect permanent?

[Shin Bilirubin]

It says TO a round, not BY a round. So on a save they are only deaf for 1 round.

[Darksol the Painbringer]

I'm not seeing the typo.

The feat says if you critically hit an enemy, they make a fortitude saving throw with the listed DC. If they fail, they're deafened permanently. If they succeed, they're deafened for 1 round.

The deafened effect isn't reduced by 1 round, as you say. It's reduced to 1 round, as the feat says.