My great-grandfather, John Henry BARBER, was born in Durham on 19 Oct 1870, son of Abel Barber and Ann nee Rose. His family were all in Kidderminster, Worcestershire and he and his mother were back in Rock Terrace, Kidderminster by the 1871 census. John was from a long line of Kidderminster weavers, who remained in the area for generations before and after his birth. I have found absolutely no family links to the north east, either maternal or paternal.
He appears on later census records as being born in "Durham, Durham" although his Royal Navy Service Record records his place of birth as Kidderminster.
Why would John have been born in Durham for no discernible reason?