Not 100% sure if this will work being I've never heard of this problem before but my answer sounds logical.... Open your baldur.ini file and scroll down to the very bottom, should show something like...
[Lua Edit]
String0=CLUAConsole:CreateCreature("Orc01")
String1=CLUAConsole:SetCurrentXP("9800000")
String2=CLUAConsole:SetCurrentXP("8800000")
String3=CLUAConsole:SetCurrentXP("7800000")
String4=CLUAConsole:SetCurrentXP("5800000")
String5=CLUAConsole:SetCurrentXP("4800000")
String6=CLUAConsole:SetCurrentXP("3800000")
String7=CLUAConsole:SetCurrentXP("2800000")
String8=CLUAConsole:SetCurrentXP("10000")
String9=
(Yes I just did a fresh install, nothing super serious in my file hehe)
Anyway... my theory would be to just erase the commands and make it like ....
[Lua Edit]
String0=
String1=
String2=
String3=
String4=
String5=
String6=
String7=
String8=
String9=