My calculations with qbrew don't seem to match pre and post boil. I've had this problem with both an Oatmeal Stout and a partial grain version of Edworts Haus Pale Ale.

For the Pale Ale, I took a gravity reading after sparging and it was 1.047 (after cooling and temperature adjusting) in about 4.8 gallons. I entered this in qbrew and adjusted to my efficiency to match and came up with 82 percent. I used this to decide how much extra pale dry malt extract to add. I added 1 lb. Before pitching yeast I took another Grain gravity reading and had 1.047 for 5.4 gallons. To make this match up in qbrew I had to adjust my efficiency for the mash down to 75 percent.

Obviously my efficiency didn't change during the boiling process, so either I am making a mistake or I am misusing qbrew some how. Well either way I am making a mistake

. Anybody have an idea where I am messing up?

Thanks in advance.