Unless the people at TrueBrew don't know how to weigh things I doubt I had false numbers on the amount of stuff that went in. When I took the gravity the temperature was about 70 (which would add a point or so but not 40).
My vote is mixing as well. I thought what I did with picking the carboy up and shaking for a few minutes would be adequate but I guess not.
So what are your suggestions for a next step? Or should I even worry about it? I'd like to actually know what my OG was but the fermentation is already underway. Is the risk of contamination worth pulling another sample? Also, not for gravity readings but for overall quailty, should I attempt more mixing?
Thanks everyone for your replies!