The Spell Shield

[Wyvern76]

Shield (spell)
Spell level: Innate level: 1, Sorcerer/Wizard: 1
School: Abjuration
Components: V, S
Range: Personal
Target/Area: Caster
Duration: 1 Minute/Level
Save: None
Spell resistance: No

Grants a +4 Shield Bonus to AC

So, I have a character Gene who is currently Rogue 3, Wis 4, and has the feat Practiced spell caster. So she casts as a level 7 caster.

I've actually got out a timer to confirm this. My Ghostly Vistage and Cats Grace, both last 7 real life minutes like they are supposed to.

Shield on the other hand lasts 3 minutes.

* * * *
Which leads me to...
Am I the only one with this odd issue with this spell?
Is it a bug effecting everyone?
Is it intentionally modified on Sundren?

If we confirm it as an NWN2 bug, I will of course forward it. But I sware that the spell used to work every where else.

[Saulus]

It's modified on Sundren to prevent people from having insanely high ACs that create an inbalance.

The duration and its effects are working exactly as we intend them to.