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I had a similar experience: I was playing on one map (I don't remember the name – I downloaded it here), captured a Swamp Castle, and had 4 Basilisk Huts and 6 Gorgon Huts on the map, while the enemy had none left. Here's the point: the Basilisk growth in the castle was 514, and the Gorgon growth was 516, and most of them were from the outer dwellings.