champen

I have found a discrepancy between sources regarding the baptism at St Just in Penwith of Elenor Champen/Champion the daughter of William and Elenor Champen/Champion. Cornwall OPC has the date as 7 Feb 1707 (Julian calendar) but Ancestry, findmypast, and FamilySearch all have 18 Feb 1708...

I have a couple buried on the same day: 14 Sep 1776 in St Just in Penwith. Their names were Lewis Champen/Champion and his wife Alice nee Wallis. Previously when I found more than one person dying about the same time in a family I have checked on a web site detailling epidemics but I can't see...