Marriage, marriage, marriage

In researching the Bishops of Burlington County, New Jersey, I came across a marriage for William R Bishop in 1860 to Mary Lee at the State's online index.

Search results for a marriage between William Bishop and Mary Lee.
Online index 1848-1878 available for free from The New Jersey State Archives.

I wondered if this was the same marriage, recorded three times, or an error in the index, or something else.  I obtained the original ledger entries from Trenton.  (If you are unable to visit Trenton, you can write to the Archives or order the microfilm through your local FamilySearch Center.)

I located the three recordings and it does indeed appear that this was the same marriage recorded in three separate locations in Burlington County.  I do not know why the marriage was recorded thrice.  Names of parents are provided in two of the recordings, giving possible leads on people born in the early 1800s- from a record made in 1860.  (The year in the index is correct, as this index is not the same index available through FamilySearch or Ancestry.)

Book C2, page 190.
Marriage of William R Bishop to Mary L Lee, 16 February 1860,
recorded in Northampton, Burlington County, New Jersey.
Parents are merely listed by their surnames.

Book C2, page 241.
Marriage of William R Bishop to Mary L Lee, 16 February 1860,
recorded in Burlington, Burlington County, New Jersey.
Parents are listed as William and Eliza R Bishop and Samuel and Jane C Lee.

Book C2, page 194.
Marriage of William R Bishop to Mary Louisa Lee, 16 February 1860,
recorded in Westhampton, Burlington County, New Jersey.
Parents are listed as William and Mary Bishop and Samuel and Jane Lee..