When a teacher is entering some grades directly into the grade book -

When this is done, it turns the grade box yellow to signal that the grade has been "overridden." As long as it is done on purpose, it is not a problem.

If a grade has been overridden by accident, follow these steps to adjust: 

1. in grade book, find the column with the overridden grade and click the pencil

2. Uncheck the box to the right of the student name, in the "override" column. If multiple grades were accidentally overridden, you can click "None"

3. Save.