Years ago I remember reading Family History Library Card Catalog description of the Bethany Church records for Tioga, Illinois. The film notes that the earliest records start in 1805. This confused me as I believed the church was founded in the 1850s. It turns out that one of the death entries in the register referred to someone who was born in 1805 and that's why the records gave that year as the earliest year.
Catalogers have a difficult job, especially with handwritten records in basically what appear to be notebooks. I always look through the material, especially if the time period is relatively close to what I need. Sometimes things get overlooked when being cataloged.