HQ-SoundClips-BG2EE VS NPC_EE

High Quality soundclips for BG2EE extended content: higher-quality voice files for EE NPCs and for the Black Pits II campaign.

You might want to try NPC_EE for character tweaking. Lets you change classes, kits, and stats.

NPC EE: Equivalent in functionality to Level 1 NPCs and SCS’ NPC customization, this mod equips all joinable NPCs with an item which, when activated, allows you to change their class, kit, stats, and/or proficiencies.

I'd be willing to bet it was Lvl 1 NPCs, given that iirc it's supposed to de-level NPCs to let you reset their class/stats. I've been using NPC EE instead and it's been pretty foolproof, in my experience.

I'd recommend NPC EE in lieu of Lvl1 NPCs, personally.

EEkeeper hasn't been properly maintained for awhile and it may not be the most reliable method for a heavily modded install. Supposedly there can be issues with certain variables and effects not getting properly saved. Dual 2 kit works fine, or you can install the NPC EE mod and use one of the kit tomes for yourself - eg, cheat it into your inventory with this code: C:CreateItem("d5_ckit") and then use the item it spawns.