As Sue says (not to be said aloud), the births have been submitted by a church member.
It is a common error to read IGI baptizmal dates as a birth date and it would appear that someone has done that in this case.
The christening date looks like a fairly good transcription from the Parish Register except for the rendition of the mother surname which should be Xtian, the common abbreviation for Christian.
There are also a couple of other IGI entries with 'abt' attached.