Just noticed that the tax office is producing too much wealth when it is producing wealth. Supposedly it produces 20% more, but my calculations it is producing 120% more.

         <GameModifier>
            <ModType>ResourceMultiplier</ModType>
            <Attribute>Gold</Attribute>
            <Value>1</Value>
            <PerTurn>1</PerTurn>
            <IsProductionQueueEmpty>1</IsProductionQueueEmpty>
            <Provides>+20% Gildar when Producing Wealth</Provides>
            <Calculate InternalName="Calc" ValueOwner="OwnerCity">
                <Expression><![CDATA[[Constructing_ProduceWealth] * 0.2]]></Expression>
            </Calculate>
            <Calculate InternalName="Value" ValueOwner="OwnerCity">
                <Expression><![CDATA[[Calc] + 1]]></Expression>
            </Calculate>
        </GameModifier>

The pink has the correction. You had 1.2, before and so the total caculation for the value would have been 2.2, not the 1.2 you were producing.