Incorrect AC bonus for Shield of the Falling Stars?

I'm playing BG using BGT and noticed that the Large Shield +1, +4 vs. Missiles: 'Shield of the Falling Stars' is giving the wrong AC bonus. The description states, "Armor Class: +2 bonus, +5 vs. Missile." Although I'm getting the correct bonus against missiles, it's only conferring a bonus of +1 to AC. Does anyone else experience this bug or is one of my mods causing this?

Installed mods and bugfixes: Baldurdash-WeiDu 1.68, BGT-WeiDU 1.10, BG1 Unfinished Business v12, BGTTweak v9