Hi,
I don't think the Std Dev bb/100 stat averages correctly across stakes. Today I've played about 500 hands of 400nl with std.dev of 112, and 500 hands of 200nl with std dev of 72. Also, I've played 20 hands of 600nl with std dev of 20. So, I expect my average to be between 72 and 112, instead the average shows as 68.