There is a known issue in Bb 8 where this isn’t calculating correctly. The workaround is to modify the total column to include each of the individual columns instead of leaving the default of all columns option selected.
To do this:
1. Go into the Grade Center
2. Click the column name for your total grade
3. Select modify column
4. In step 3, choose the "Select Grade Columns, Calculated Columns and Categories" option
5. Select all columns (including the extra credit column) and click the arrow for these to be included in the final grade.
6. Click submit
The total column should now be including the extra credit column.
