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If your batch is 5 gallons, the SG delta would be 41 (the points in 1 pound of lactose, apparently it hydrates and I did not take that into account) / 5 gal (the volume of the batch). That's 8.2 unfermentable points of gravity. Another hypothesis: You're off by 4 points - that's really not much, a half-pound of sugar in a 5 gallon batch. Measurements can err, the FG is a prediction so it may just be that your final gravity is just 4 points high.