OG with a kit can't be off if you have the right wort volume in total- sugars don't evaporate (well, I guess if you burned them at the bottom of your kettle that would eliminate them).
Wort stratifies quickly, so it is likely that it wasn't homogenous when you measured, and you got a lower gravity because the densest wort is at the bottom. Stir gently but well, homogenize the wort, then take a measurement.
Okay question.. Is the wort still considered wort when I put it in the Carboy? 2.5 gallons water was added to kettle and added LME DME and all others followed by instructions. Now After chilling I added it to my Carboy and toped off with water. Then I took a sample in my wine thief and got 1.042.
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Yes - you want a lot of aeration at that point of the process. Stir with the end of a brew spoon, or a drill mounted wine degasser - make some foam.