Viconia - Medium Shield

Hi all.

I didn't want to post this as a bug as my knowledge of ADnD is pretty basic at best so thought I'd ask here and see.

I'm starting a new playthrough today and am currently working on getting my party together, I just rescued Viconia to be my Cleric.

The problem I'm having is Viconia has 10 Strength and the Strength requirement for a Medium Shield is 9 but the game isn't letting me equip one.

I have tried removing all armour, I have slept, made sure there are no debuffs or anything on her but..nope, nothing.

I'm just curious if this is a bug or if I have overlooked something?

Thanks x

Edit: Reading over my post, I missed a couple of semi important details.

I am using the newest patch for BG2EE "Update 6" and the error message I get when trying to equip the shield is "Inadequate strength"