Garmin Vivofit 3, could the math be wrong?

At one point I had a Fitbit, which I ditched as I felt it wasn't accurate with my job. I know have a Vivofit 3, the steps it's counting seem a little high but could be correct for all the moving around I do, problem (to me) seems to be when it uploads to crononmeter and does the math based on what I know from my previous fitbit it seems to take WAY too many calories back off. I had ~12,000 steps yesterday which is believable for me, and it was taking over 2000 calories back off of me, seems like WAY too much for what I did. My height/weight/age etc is correct on both ends, is there something I should check on either end that could be sending that way off? Or is it not that simple?

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