Quite often men have short memories/can't be bothered with the analytics & write what seems easiest at the time.
Who gave the info. in 1911?
I don't think men in general care too much about specifics i.e. near is 'near enough' 
Annie
Is this tongue in cheek ??
Tongue in cheek or not, there is some truth in what you say

and I'm a man. At the risk of being cancelled, men and women are very different. Men are better at some things than women, and vice versa. The two sexes have a different psychological make-up, and they are generally interested in different things - 'generally' being the operative word here. Anyway, enough of this; to the matter in hand:
Kennedy's birth cert gives 12 Bridge Street, Chepstow as his place of birth. The informant was his mother, who registered the birth 42 days after it took place. The father's occupation looks like 'Striker, Iron Foundry'. Incidentally, the address of PoB is given as '..... Chepstow, WSD, Mon'. What might the 'WSD' be?
1891: PoB - Chepstow. However, PoB for elder sibling (older by just 12 months) is given as Tidenham
1901: PoB - Chepstow. Sibling - Tutshill (geographically almost the same as Tidenham)
1911: Now known as 'Devauden', PoB given as Leamington, I think in his own hand on the census return; undoubtedly a misrepresentation
1921: Devauden gives his PoB in his own hand as Tidenham, Glos
Death cert - currently on order
I also believe Chepstow to be his actual place of birth. Yes, why would the mother lie about this? The only thing I can think of could be that there was some sort of disadvantage to be born outside a particular parish, but I can't think what. Alternatively, maybe 'Devauden' didn't wish to be considered a Welshman, but this seems unlikely.