Session Stats not calculating correctly

[Cusimanse]

It seems as if the session stats calculation is off.  I've been looking at it in askance for some time, but today brought it into clear focus.  I've played two games thus far today; my first was a WN8 of 1759, my second was a 0 (bad positioning and team getting wiped quickly), which to me would indicate an 879 rating for the day (1759/2), but it's showing a 491.  Is there some weighting going on behind the curtain?

[Aslain]

All such calculations are based on many factors and predictions. If you think some values are wrong you can contact the mod author for more detailed explanations.