<QuestChoiceDef>
<Description>Build communes for the sick and force them to live apart from us (-50 gildar)</Description>
<RequiredConditionID>0</RequiredConditionID>
<NextObjectiveID>1</NextObjectiveID>
<Treasure>
<GameModifier>
<ModType>Resource</ModType>
<Attribute>Gold</Attribute>
<Value>-50</Value>
</GameModifier>
</Treasure>
</QuestChoiceDef>
The bolded treasure above should be removed since the option to choose requires a condition of 50 gold and by how the quests work you will be charged automatically the 50 gold by the condition, then another 50 by this treasure addition.
<QuestConditionDef>
<ID>0</ID>
<Objective>
<Icon>Mana_32.png</Icon>
<Text>You need 50 gildar to build the commune</Text>
<IsOptional>0</IsOptional>
</Objective>
<Class>ChoiceUnlock</Class>
<Type>CheckForResource</Type>
<TextData>Gold</TextData>
<NumericData>50</NumericData>
</QuestConditionDef>
This is the condition that is already charging and checking for the 50 gold in the first place.