To find out why assessment grading categories or descriptions are duplicating 
  1. Go to Academics > Grading > Grades > Grading Setup > School Year Setup 
  2. Filter on School Year, Group Type, School Level, Grade Plan Groups
  3. Compare the terms and the sort order for each descriptions in each category to make sure they match up in each semester.
  4. Correcting the sort order will correct the problem with the report card formatting
  5. Check in both the Edit Next to the skill and the sort order of the skills
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In addition, if one semester is on one page and the other is on a second page, check to see if the course is being taught by a different teacher. This will cause the report card to separate the grades per semester per teacher.