Ever since the switch to Prime95/mprime, the rates on the SoB page are not very accurate for shorter time periods like 1 day. For the last days rate, I think it includes the time since the last check-in, where your work done is basically 0. I always look at the 7-day rate graph and not the number below to get an accurate number. It looks like you are around 17M jEMs according to the graph, which comes to 1.47T jEM's/day, which matches up with your the Free-DC stats perfectly. (http://stats.free-dc.org/stats.php?p...=sob&name=2437). The Free-DC stats seem to be much more accurate, I think just due to the different way the numbers are calculated.
And I don't understand the arrows either. They often don't seem to make sense and they never have. :P If you are interested in movement in the rankings, the Free-DC stats seem to do a better job once again.