NORMAL and HEROIC the Units are in the individual Quests.
But in MASTER and UC they are in the Chapters as a whole. So you did Master quests 1 and 2 of Chapter 1 before getting 10 Units for completion of Chapter itself (instead of quest 1 for 5 and then quest 2 for 5 as lower difficulties are).
Not quite sure why the difference between difficulties, but Units seem to come out the same.
Comments
But in MASTER and UC they are in the Chapters as a whole. So you did Master quests 1 and 2 of Chapter 1 before getting 10 Units for completion of Chapter itself (instead of quest 1 for 5 and then quest 2 for 5 as lower difficulties are).
Not quite sure why the difference between difficulties, but Units seem to come out the same.