In a nutshell: rolled a bard, picked Khalid and Jaheira, then went straight to Nashkel, so everyone's lvl 1, there can be no scaling involved. However, Minsc joined ready to level up - to lvl 6 no less! Is this a bug? I've upgraded the game as suggested in the "Enhance the gameplay" thread plus added the NPC project mod if it's relevant.

I dunno what happened but that's clearly not intended...

Post your weidu.log here.

Sounds like the old UB bug but post your Weidu list.

It's a bug with BGT - you can use shadowkeeper (or the console maybe) to reset him to level 1 and maybe a few experience points. (I know the console can: SetCurrentXP("150") for example but I don't know if it can set a different level - reducing XP by itself won't delevel you).

edit: at least I thought it was BGT - ussnorway thinks it's a UB bug,... hmm, (I think I always had both installed after my first playthrough).

Hope that's what you mean by Weidu log. Still, the problem is hardly game breaking. It's not like I have much to replay. Thanks for your responses guys.

// Log of Currently Installed WeiDU Mods
// The top of the file is the 'oldest' mod
// ~TP2_File~ #language_number #component_number // [Subcomponent Name -> ] Component Name [ : Version]
~DDRAWFIX/DDRAWFIX.TP2~ #0 #0 // DDrawFix -> Force DirectDraw Emulation: v1.0
~BG2FIXPACK/SETUP-BG2FIXPACK.TP2~ #0 #0 // BG2 Fixpack - Core Fixes: v10
~BG2FIXPACK/SETUP-BG2FIXPACK.TP2~ #0 #1000 // BG2 Fixpack - Game Text Update -> GTU Light (by Wisp): v10
~BG2FIXPACK/SETUP-BG2FIXPACK.TP2~ #0 #3 // BETA Core Fixes (please check the readme!): v10
~BG2FIXPACK/SETUP-BG2FIXPACK.TP2~ #0 #100 // Party Gets XP for Sending Keldorn to Reconcile With Maria: v10
~BG2FIXPACK/SETUP-BG2FIXPACK.TP2~ #0 #101 // Improved Spell Animations: v10
~BG2FIXPACK/SETUP-BG2FIXPACK.TP2~ #0 #102 // Cromwell's Forging Actually Takes a Day: v10
~BG2FIXPACK/SETUP-BG2FIXPACK.TP2~ #0 #103 // Mixed-Use Dagger Fixes: v10
~BG2FIXPACK/SETUP-BG2FIXPACK.TP2~ #0 #104 // Ghreyfain's Holy Symbol Fixes: v10
~BG2FIXPACK/SETUP-BG2FIXPACK.TP2~ #0 #106 // Giants Receive Penalties When Attacking Halflings, Dwarves, and Gnomes: v10
~BG2FIXPACK/SETUP-BG2FIXPACK.TP2~ #0 #107 // Remove Dual-Classing Restriction from Archers and Stalkers: v10
~BG2FIXPACK/SETUP-BG2FIXPACK.TP2~ #0 #108 // Remove Second Attribute Bonus for Evil Path in Wrath Hell Trial: v10
~BG2FIXPACK/SETUP-BG2FIXPACK.TP2~ #0 #109 // Corrected Summoned Demon Behavior: v10
~BG2FIXPACK/SETUP-BG2FIXPACK.TP2~ #0 #110 // Additional Script Fixes: v10
~BG2FIXPACK/SETUP-BG2FIXPACK.TP2~ #0 #111 // Bard Song Fixes: v10
~BG2FIXPACK/SETUP-BG2FIXPACK.TP2~ #0 #112 // Wizard Slayers Cause Miscast Magic on Ranged Attacks: v10
~BG2FIXPACK/SETUP-BG2FIXPACK.TP2~ #0 #113 // Additional Alignment Fixes: v10
~BG2FIXPACK/SETUP-BG2FIXPACK.TP2~ #0 #114 // Change Free Action to Protect Against Stun: v10
~BG2FIXPACK/SETUP-BG2FIXPACK.TP2~ #0 #116 // Remove Thieving Start Bonuses from Bard and Ranger Skills: v10
~SETUP-BGT.TP2~ #0 #0 // Baldur's Gate Trilogy - Core: 1.18 (28 Apr 13)
~BG1UB/SETUP-BG1UB.TP2~ #0 #0 // Ice Island Level Two Restoration: v13_120121
~BG1UB/SETUP-BG1UB.TP2~ #0 #1 // The Mysterious Vial: v13_120121
~BG1UB/SETUP-BG1UB.TP2~ #0 #2 // Additional Elminster Encounter: v13_120121
~BG1UB/SETUP-BG1UB.TP2~ #0 #3 // Angelo Notices Shar-teel: v13_120121
~BG1UB/SETUP-BG1UB.TP2~ #0 #4 // Finishable Kagain Caravan Quest: v13_120121
~BG1UB/SETUP-BG1UB.TP2~ #0 #5 // Coran and the Wyverns: v13_120121
~BG1UB/SETUP-BG1UB.TP2~ #0 #6 // Kivan and Tazok: v13_120121
~BG1UB/SETUP-BG1UB.TP2~ #0 #7 // Branwen and Tranzig: v13_120121
~BG1UB/SETUP-BG1UB.TP2~ #0 #8 // Safana the Flirt: v13_120121
~BG1UB/SETUP-BG1UB.TP2~ #0 #9 // Appropriate Albert and Rufie Reward: v13_120121
~BG1UB/SETUP-BG1UB.TP2~ #0 #10 // Place Entar Silvershield in His Home: v13_120121
~BG1UB/SETUP-BG1UB.TP2~ #0 #11 // Scar and the Sashenstar's Daughter: v13_120121
~BG1UB/SETUP-BG1UB.TP2~ #0 #12 // Quoningar, the Cleric: v13_120121
~BG1UB/SETUP-BG1UB.TP2~ #0 #13 // Shilo Chen and the Ogre-Magi: v13_120121
~BG1UB/SETUP-BG1UB.TP2~ #0 #14 // Edie, the Merchant League Applicant: v13_120121
~BG1UB/SETUP-BG1UB.TP2~ #0 #15 // Flaming Fist Mercenary Reinforcements: v13_120121
~BG1UB/SETUP-BG1UB.TP2~ #0 #16 // Creature Corrections: v13_120121
~BG1UB/SETUP-BG1UB.TP2~ #0 #17 // Creature Restorations: v13_120121
~BG1UB/SETUP-BG1UB.TP2~ #0 #18 // Creature Name Restorations: v13_120121
~BG1UB/SETUP-BG1UB.TP2~ #0 #19 // Minor Dialogue Restorations: v13_120121
~BG1UB/SETUP-BG1UB.TP2~ #0 #20 // Audio Restorations: v13_120121
~BG1UB/SETUP-BG1UB.TP2~ #0 #21 // Store, Tavern and Inn Fixes and Restorations: v13_120121
~BG1UB/SETUP-BG1UB.TP2~ #0 #22 // Item Corrections and Restorations: v13_120121
~BG1UB/SETUP-BG1UB.TP2~ #0 #23 // Area Corrections and Restorations: v13_120121
~BG1UB/SETUP-BG1UB.TP2~ #0 #24 // Permanent Corpses: v13_120121
~BG1UB/SETUP-BG1UB.TP2~ #0 #26 // The Original Saga Music Playlist Corrections: v13_120121
~BG1UB/SETUP-BG1UB.TP2~ #0 #27 // Sarevok's Diary Corrections: v13_120121
~SETUP-UB.TP2~ #0 #0 // The Kidnapping of Boo by Cliffette: v19
~SETUP-UB.TP2~ #0 #1 // The Suna Seni/Valygar Relationship: v19
~SETUP-UB.TP2~ #0 #2 // Kalah and What He Was Promised: v19
~SETUP-UB.TP2~ #0 #3 // "Cat and Mouse" (Bodhi hunts you in Spellhold) by Ghreyfain: v19
~SETUP-UB.TP2~ #0 #4 // Gorje Hilldark and the Extended Illithium Quest: v19
~SETUP-UB.TP2~ #0 #5 // The Pai'Na/Spider's Bane Quest: v19
~SETUP-UB.TP2~ #0 #6 // Restored Crooked Crane Inn: v19
~SETUP-UB.TP2~ #0 #7 // Restored Encounters: v19
~SETUP-UB.TP2~ #0 #8 // Artemis Entreri in Bodhi's Lair: v19
~SETUP-UB.TP2~ #0 #9 // Corrected "Xzar's Creations": v19
~SETUP-UB.TP2~ #0 #10 // Restored Hell Minions, by SimDing0: v19
~SETUP-UB.TP2~ #0 #12 // Item Restorations: v19
~SETUP-UB.TP2~ #0 #13 // Yoshimo's Original Portrait: v19
~SETUP-UB.TP2~ #0 #14 // Anomen's Original Portrait: v19
~SETUP-UB.TP2~ #0 #15 // NPC Portrait Restorations: v19
~SETUP-UB.TP2~ #0 #16 // Corrected BAMs and Scripts: v19
~SETUP-UB.TP2~ #0 #17 // Corrected Character Names and Biographies: v19
~SETUP-UB.TP2~ #0 #18 // Restored Minor Dialogs: v19
~SETUP-UB.TP2~ #0 #19 // Restored Bhaalspawn Powers, by David Gaider: v19
~SETUP-UB.TP2~ #0 #20 // Extended ToB Item Descriptions: v19
~SETUP-UB.TP2~ #0 #21 // Throne of Bhaal Minor Restorations: v19
~SETUP-UB.TP2~ #0 #22 // Justifier Kit: v19
~SETUP-UB.TP2~ #0 #23 // Feralan Kit: v19
~SETUP-UB.TP2~ #0 #24 // Sarevok's Remorse: v19
~BG1NPC.TP2~ #0 #0 // The BG1 NPC Project: Required Modifications: v20
~BG1NPC.TP2~ #0 #1 // The BG1 NPC Project: Banters, Quests, and Interjections: v20
~BG1NPC.TP2~ #0 #2 // The BG1 NPC Project: Give Edwin his BG2 portrait: v20
~BG1NPC.TP2~ #0 #3 // The BG1 NPC Project: Give Imoen her BG2 portrait: v20
~BG1NPC.TP2~ #0 #4 // The BG1 NPC Project: Give Jaheira her BG2 portrait: v20
~BG1NPC.TP2~ #0 #5 // The BG1 NPC Project: Give Minsc his BG2 portrait: v20
~BG1NPC.TP2~ #0 #6 // The BG1 NPC Project: Give Viconia her BG2 portrait: v20
~BG1NPC.TP2~ #0 #7 // The BG1 NPC Project: Kivan's "Kivan and Deheriana Companions" portrait: v20
~BG1NPC.TP2~ #0 #8 // The BG1 NPC Project: Add Non-Joinable NPC portraits to quests and dialogues: v20
~BG1NPC.TP2~ #0 #9 // The BG1 NPC Project: Ajantis Romance Core (teen content): v20
~BG1NPC.TP2~ #0 #10 // The BG1 NPC Project: Branwen's Romance Core (teen content): v20
~BG1NPC.TP2~ #0 #11 // The BG1 NPC Project: Coran's Romance Core (adult content): v20
~BG1NPC.TP2~ #0 #12 // The BG1 NPC Project: Dynaheir's Romance Core (teen content): v20
~BG1NPC.TP2~ #0 #13 // The BG1 NPC Project: Shar-Teel Relationship Core (adult content): v20
~BG1NPC.TP2~ #0 #14 // The BG1 NPC Project: Xan's Romance Core (teen content): v20
~BG1NPC.TP2~ #0 #15 // The BG1 NPC Project: Female Romance Challenges, Ajantis vs Xan vs Coran: v20
~BG1NPC.TP2~ #0 #27 // The BG1 NPC Project: Bardic Reputation Adjustment: v20
~BG1NPC.TP2~ #0 #200 // The BG1 NPC Project: Player-Initiated Dialogues: v20
~SETUP-BGTMUSIC.TP2~ #0 #1 // Baldur's Gate Trilogy - Music -> Hybrid Baldur's Gate/Shadows of Amn/Throne of Bhaal Music
~WIDESCREEN/WIDESCREEN.TP2~ #0 #0 // Widescreen Mod -> for the original Infinity Engine (CHOOSE THIS!): Widescreen Mod v3.02

UB and npc use some of the same variables and these parts should be dropped from the UB when npc is also used;
1. Angelo Notices Shar-Teel
2. Finishable Kagain Caravan Quest
3. Coran and the Wyverns
4. Kivan and Tazok
5. Branwen and Tranzig
Reference = http://forums.gibberlings3.net/index.php?showtopic=8122

To be fair this forum post is quite old and does assume Tutu but since BGT has the same engine it's a safe bet that the same bugs apply to a BGT install.

This is from memory but I think the Minsc level 6 bug is caused because when the game checks your level to determines which Minsc's characters to use the other smaller ones have been overridden… the only work around I'm aware of is to wait longer before recruiting him.

Sorry but I'm not a fixpack enthusiast and therefore don't play BGT… good luck with it, Vindici.

You would need to lower his HP, saving throws and uses of his ranger ability (control animal?) too, right? Otherwise he would get benefits from leveling again.

Oh right, forgot about those.
Need to raise THAC0 too and maybe base AC?

So quite a bit of editing back to base ranger class.

Maybe you could just kill Minsc with ctrl+y and then CreateCreature("Minsc1.cre") (or whatever the name is for the level 1 Minsc creature file - can't check as I'm at work right now).

FYI this webpage shows the stats for the different npc http://www.forgottenwars.com/bg1/good.htm and their levels.