A number of factors affect the total number of possible attendance sessions for a student in any given date range.
- The student may have been assigned some not-counted attendance codes within the report's date range: List of Register Attendance Codes
- The student may have only recently arrived at the school, so check their entry date, if they are a new student to the school.
- The student may be missing some attendance codes. Check to see if there are any gaps in attendance for them on their student profile attendance tab: Gaps in attendance