Zito

I'm not really sure this is a bug, but i guess it has to be. When i go to the cultist dungeon with the Company of Eight most of the cultists drop like 65000 gold pieces.
I had about 140k gold when i came here. Now i have like 880k. and once a cultist dropped 65533 unidentified gems!
i haven't finished the quest because if there's a fix i may play the quest from the beginning as i have a saved game just before this quest.

You mean 'Undead Ciltists'? If so, plz post here your WeiDU log - something has screwed you random treasure tables....

Yes, i mean the undead cultists, sorry. here's my weidu log:

// 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
~SETUP-BD-TOB.TP2~ #0 #0 // Baldurdash Fix Pack for ToB, v1.5 WeiDU
~SETUP-BD-TOB.TP2~ #0 #1 // Textupdatepack -> Baldurdash English Text Update Pack for ToB, v1.4 WeiDU
~SETUP-SOS.TP2~ #0 #0 // Shadows Over Soubar, v1.10
~SETUP-SOS.TP2~ #0 #1 // Remorhaz walking speed adjustment (for ENGLISH version .EXE ONLY!!!)
~SETUP-TDD.TP2~ #0 #0 // The Darkest Day, v1.10
~SETUP-TDD.TP2~ #0 #1 // TDD Character Kits
~SETUP-CTB.TP2~ #0 #0 // Check The Bodies, v1.7
~SETUP-CTB-CHORES.TP2~ #0 #0 // Candlekeep Chores, v2.0
~SETUP-TS-BP.TP2~ #0 #0 // TORTURED SOULS v6.04.01 (BP Compatible Version)
~SETUP-VALEN.TP2~ #0 #0 // Valen
~SETUP-VALEN.TP2~ #0 #10 // Give More Creatures Protection From Level Drain & Undead
~SETUP-D0QUESTPACK.TP2~ #0 #1 // Boss Improvements
~SETUP-D0QUESTPACK.TP2~ #0 #2 // Miscellaneous Enhancements
~SETUP-D0QUESTPACK.TP2~ #0 #3 // Additional Shadow Thieves Content
~SETUP-D0QUESTPACK.TP2~ #0 #4 // Alternative Harper/Xzar Plot
~SETUP-D0QUESTPACK.TP2~ #0 #5 // Extended Reynald Sequence
~SETUP-D0QUESTPACK.TP2~ #0 #6 // Intrigue In The Copper Coronet
~SETUP-D0QUESTPACK.TP2~ #0 #7 // Rahul Kanakia's Potion Quest
~SETUP-D0QUESTPACK.TP2~ #0 #8 // Revised Hell Trials
~SETUP-D0QUESTPACK.TP2~ #0 #10 // Improved Oasis II -> IO2 Dialogue Enhancement Only
~SETUP-D0QUESTPACK.TP2~ #0 #11 // Saving Sanik In Brynnlaw
~SETUP-D0QUESTPACK.TP2~ #0 #12 // Burglary Of The Bookkeeper
~SETUP-D0QUESTPACK.TP2~ #0 #13 // New Fate For The Dryads' Acorns
~SETUP-D0QUESTPACK.TP2~ #0 #14 // The Tragedy Of Besamen
~SETUP-D0QUESTPACK.TP2~ #0 #15 // Further Slaver Involvement
~SETUP-D0QUESTPACK.TP2~ #0 #16 // Sending The Solamnic Knights Home
~SETUP-D0QUESTPACK.TP2~ #0 #17 // Nazariel The Lich
~SETUP-D0QUESTPACK.TP2~ #0 #18 // Reward Negotiation
~SETUP-BPV176.TP2~ #0 #0 // Big Picture AI/Enhancement Mod, version 176 weidu (beta)
~SETUP-BPV176.TP2~ #0 #1 // Improved Suldanessallar
~SETUP-BPV176.TP2~ #0 #2 // Improved Spellhold
~SETUP-BPV176.TP2~ #0 #3 // Wand of Orcus Add-In
~SETUP-BPV176.TP2~ #0 #4 // Improved Small Teeth Pass, by Kensai Ryu
~SETUP-BPV176.TP2~ #0 #5 // Improved Kangaxx Encounter, by Kensai Ryu
~SETUP-BPV176.TP2~ #0 #6 // Kensai Ryu's Improved Crypt King
~SETUP-BPV176.TP2~ #0 #7 // Kensai Ryu's Gnome Fighter/Illusionist in the Docks
~SETUP-BPV176.TP2~ #0 #8 // Improved Random Encounters, by Gebhard Blucher and Kensai Ryu
~SETUP-BPV176.TP2~ #0 #9 // Gebhard Blucher's Lich in the Docks
~SETUP-BPV176.TP2~ #0 #10 // Red Badge, Poison-Based Encounter, by Westley Weimer
~SETUP-BPV176.TP2~ #0 #11 // Kuroisan the Acid Kensai, by Westley Weimer
~SETUP-BPV176.TP2~ #0 #12 // The Ritual, by Westley Weimer
~SETUP-BPV176.TP2~ #0 #14 // Ascension for BP
~G3TWEAKS.TP2~ #0 #0 // SoA World Map Fixes
~G3TWEAKS.TP2~ #0 #3 // Change Magically Created Weapons to Zero Weight
~G3TWEAKS.TP2~ #0 #6 // Make +x/+y Weapons Consistent
~G3TWEAKS.TP2~ #0 #7 // English Only: Description Updates for Make +x/+y Weapons Consistent Component
~G3TWEAKS.TP2~ #0 #37 // Remove Helmet Animations
~G3TWEAKS.TP2~ #0 #40 // Change Imoen's Avatar to Mage
~G3TWEAKS.TP2~ #0 #41 // Change Nalia's Avatar to Thief
~G3TWEAKS.TP2~ #0 #43 // Change Viconia's Skin Color to Dark Blue
~G3TWEAKS.TP2~ #0 #46 // Avatar Morphing Script
~G3TWEAKS.TP2~ #0 #49 // Weapon Animation Tweaks
~G3TWEAKS.TP2~ #0 #52 // Icewind Dale Casting Graphics (Andyr)
~G3TWEAKS.TP2~ #0 #55 // Restore SoA Load Screen Logo (ToB Only)
~G3TWEAKS.TP2~ #0 #58 // Disable Portrait Icons Added by Equipped Items
~G3TWEAKS.TP2~ #0 #61 // Commoners Use Drab Colors
~G3TWEAKS.TP2~ #0 #64 // Icon Improvements
~G3TWEAKS.TP2~ #0 #67 // Change Avatar When Wearing Robes or Leather Armor (Galactygon)
~G3TWEAKS.TP2~ #0 #70 // Gems and Potions Require Identification
~G3TWEAKS.TP2~ #0 #91 // Force All Dialogue to Pause
~G3TWEAKS.TP2~ #0 #94 // Use Valen/Solaufein Style Interjections
~G3TWEAKS.TP2~ #0 #97 // Alter HP Triggers for NPC Wounded Dialogues
~G3TWEAKS.TP2~ #0 #100 // Two-Handed Bastard Swords
~G3TWEAKS.TP2~ #0 #103 // Two-Handed Katanas
~G3TWEAKS.TP2~ #0 #106 // Universal Clubs
~G3TWEAKS.TP2~ #0 #107 // English Only: Description Updates for Universal Clubs Component
~G3TWEAKS.TP2~ #0 #110 // Weapon Styles for All
~G3TWEAKS.TP2~ #0 #113 // Reveal Wilderness Areas Before Chapter Six
~G3TWEAKS.TP2~ #0 #116 // Improved Athkatlan City Guard
~G3TWEAKS.TP2~ #0 #119 // Druids Use Cleric Level and Spell Progression
~G3TWEAKS.TP2~ #0 #122 // Delay High Level Abilities
~G3TWEAKS.TP2~ #0 #137 // Expanded Dual-Class Options
~G3TWEAKS.TP2~ #0 #143 // Gradual Drow Item Disintegration
~G3TWEAKS.TP2~ #0 #152 // Sellable Staffs, Clubs, and Slings (Icelus)
~G3TWEAKS.TP2~ #0 #155 // PnP-Style Protection Items
~G3TWEAKS.TP2~ #0 #158 // Rebalanced Weapon Proficiencies
~G3TWEAKS.TP2~ #0 #191 // 100% Learn Spells
~G3TWEAKS.TP2~ #0 #197 // Add Ammo Belts and Potion Cases to SoA
~G3TWEAKS.TP2~ #0 #200 // PnP Spell Progression Tables
~G3TWEAKS.TP2~ #0 #203 // Remove fatigue from restoration spells
~G3TWEAKS.TP2~ #0 #221 // Improved Fate Spirit Summoning
~G3TWEAKS.TP2~ #0 #224 // ToB-Style NPCs
~G3TWEAKS.TP2~ #0 #227 // Give Edwin his BG Stats
~G3TWEAKS.TP2~ #0 #230 // Give Jaheira her BG Stats
~G3TWEAKS.TP2~ #0 #231 // Change Jaheira to Neutral Good
~G3TWEAKS.TP2~ #0 #233 // Give Minsc his BG Stats
~G3TWEAKS.TP2~ #0 #236 // Give Viconia her BG Stats
~SETUP BP-BGT WORLDMAP.TP2~ #0 #0 // Revised worldmap for the Baldur's Gate - Big Picture compatibility mod including coloured Baldur's Gate map icons
~SETUP BP-BGT WORLDMAP.TP2~ #0 #2 // Use new worldmap for Throne of Bhaal as well
~SETUP-CTB_FF.TP2~ #0 #0 // Check the Bodies Fast Forward?
~SETUP-CTB17FIX1.TP2~ #0 #0 // Fix #1 for CtB v1.7

..........

and just one more thing i just can't kill zannaster the mage although i damage him like 100 times after he's near death.

I'm not really sure this is a bug, but i guess it has to be. When i go to the cultist dungeon with the Company of Eight most of the cultists drop like 65000 gold pieces.
I had about 140k gold when i came here. Now i have like 880k. and once a cultist dropped 65533 unidentified gems!
i haven't finished the quest because if there's a fix i may play the quest from the beginning as i have a saved game just before this quest.