by Mark Glynn.
Clay,
I share your frustration. I have encountered similar problems. Two elements which appear to be the source of your errors:
First the lowest score on the rubric for each criteria should be set to zero for the calculation to work properly
Second to the best of my knowledge rubrics don't take marks with decimal points. Your 6.8 is changed to 6 for the purpose of the calculation but you may want to manually check that to be sure
I hope this helps
kind regards
Mark