I'm the bishop of a ward. My Gospel Living App has many duplicate circles. Here is the list of my Joined Circles:
Bishopric
Deacons Quorum
My Household
Priests Quorum
Priests Quorum Presidency
Primary Presidency
Primary Presidency
Sunday School Presidency
Sunday School Presidency
Teachers Quorum
Ward Council
Ward Primary Activity - Girls
Ward Youth Council
Ward Youth Council
Young Men
Young Men
Young Women
Young Women
Young Women 12-14
Young Women 12-14 Class Presidency
Young Women 15-18
Young Women 15-18 Class Presidency
Young Women Presidency
Young Women Presidency
Youth
Youth
For the duplicates (Primary Presidency, Sunday School Presidency, Ward Youth Council, Young Men, Young Women, Young Women Presidency, Youth) the membership of each circle is identical (same people listed), but the content is not. For example, the lower "Youth" circle contains several messages with the "Youth" circle just above it is empty.