To see the breakdown of how a GPA got calculated for a Student go to onRecord > People Finder and on the right hand side you will see a section header called Grade Averages. The name of the Grade Average will be listed here along with number Grade Average. If you click on the name a pop up screen will appear with the Grade Average formula and a break down of how the system calculated the GPA.
If the Grade Average formula needs to be adjusted you can go to onRecord > Settings > Grade Averages and edit the Grade Average to adjust the formula, adjust the grades that are included in the formula as well as adjust excluded courses.
For Grade Averages where you are not able to get the calculations to match (after reviewing the information above), please send a copy of the GPA breakdown calculations to Support for review.