Hi Kim,
The IGI entry for Robert`s birth is a "member submitted" record and not an extracted record taken from the actual parish registers. As they haven`t even found a date for the baptism I would treat this with caution. It looks like it is a "guesstimate" probably based on his age at marriage or a census return.
The 1851 has a Joseph Chipindale (sic) living with the Clayton`s in Dutton. It looks like Mary Clayton married him in June Qtr. 1851. Robert is down as his son and a Chippendale in the 1861 census. I think it would be worth searching for his and his siblings baptisms as they are sometimes far more revealing.
If you need the census entry let me know
Regards,
Mo