Glancing at the treasury vault calculation there is an error. When producing wealth the bonus is 130% not the 30% advertised. Here is the fix

       <GameModifier>
            <ModType>ResourceMultiplier</ModType>
            <Attribute>Gold</Attribute>
            <Value>1</Value>
            <PerTurn>1</PerTurn>
             <IsProductionQueueEmpty>1</IsProductionQueueEmpty>
            <Provides>+30% Gildar when Producing Wealth</Provides>
             <Calculate InternalName="Calc" ValueOwner="OwnerCity">
                <Expression><![CDATA[[Constructing_ProduceWealth] * .3]]></Expression>
            </Calculate>
            <Calculate InternalName="Value" ValueOwner="OwnerCity">
                <Expression><![CDATA[[Calc] + 1]]></Expression>
            </Calculate>
        </GameModifier>

The portion highlighted is all that needs to be changed (.3 instead of 1.3)