I've been robbed of 1 armor. I recently bought some twink gear, expecting my armor to go up to 1373. After putting on the items, my armor was only 1372. The game is doing addition improperly to rob me of 1 armor....what gives?

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224+336+125+275+400+13 = 1373, not 1372. So why am I being robbed of 1 armor?