I would be interested to know whether you can replicate this potential Grade Center issue. I'm experiencing this issue with both 2015 Q4 CU1 and 2016 Q4 CU3
In a test course go to the Grade Center and make two columns. Put some scores for some test student in each column e.g.
Then look at the Column Statistics for the Total Column:
Note that the Minimum, maximum and average are incorrectly calculated.
Do you find the same result, i.e. that the calculations are incorrect?
If so I would appreciate you raising a ticket to Bb support. My ticket is #02748012.