Screaming Torchfiend's Burning Scowl

I upgraded this season 4 piece to 496 from 480 (season 3) using the catalyst and yet, it says, it’s a 34% downgrade, apparently since it doesn’t appear to contribute to the set “Screaming Torchfiend’s Brutality”.

Is this a Blizzard problem or AMR’s?

$133;US;Alexstrasza;Taldazlian;Dragon 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It is my understanding that you cannot mix the season 4 set items with any season 3 or earlier set items. They are a completely different item set (different item IDs, different item set IDs), despite having the same name and set bonuses in some cases.