[1.2][BUG] Firestorm calculation / description mis-match

Looking through spell calculations, I've noticed the following problem. (Code snippet below bolded appears to be the error)

        <DisplayName>Firestorm</DisplayName>
        <Description>All units in target army take 8 fire damage (+4 per fire shard).  Firestorm leaves a fire raging in the affected tile for 10 turns.</Description>

By the looks of the calculation I see 8 fire damage + 2 per fire shard, not the +4.

        <GameModifier>
            <ModType>Unit</ModType>
            <Attribute>DefendableDamage</Attribute>
            <AttackStat>UnitStat_Attack_Fire</AttackStat>
            <Calculate InternalName="Calc" ValueOwner="CastingUnit">
                <Expression><![CDATA[[UnitOwner_GetNumFireShards] * 2]]></Expression>
            </Calculate>
            <Calculate InternalName="Calc2">
                <Expression><![CDATA[[Calc] + 8]]></Expression>
            </Calculate>
            <Calculate InternalName="Calc3" ValueOwner="CastingUnit">
                <Expression><![CDATA[[Calc2] * [UnitStat_SpellDamage_Fire]]]></Expression>
            </Calculate>
            <Calculate InternalName="Value">
                <Expression><![CDATA[[Calc3]]]></Expression>
            </Calculate>
        </GameModifier>