Check for accidentally excluded grade items

If something is not being counted into a student's total first check the User Report for that specific student and check the Weight column. If one has a dropped it can mean either you have "Drop the lowest" turned on for that category or grade item (check out the resource Drop the Lowest Grade in a Category) or this resource on checking excluded grade items for specific students. You generally do not want to exclude a grade item for a specific student unless there is a very specific reason for doing so.