By default the Course Site gradebook shows the "Real" grade type. Which is simply the raw points the student currently has accumulated. To show a different grade type (i.e., Grade, Percentage, etc) the grade type needs to be changed.
Go to Administration>Course administration>Gradebook setup.
Next, click on the "Course grade Settings" tab and change the Grade Display type to your preference.
For more information about Grade Display Types, please visit http://docs.moodle.org/en/Grade_item_settings#Grade_display_type