Every time the probate calendar states that a person's last address was in "the county of Anglesea" -- which must be a few hundred thousand individuals by the name of Jones alone -- the Ancestry transcript tells us the place of death was "Anglesey, Staffordshire, England". I suppose one or two could have died while visiting relatives in the English midlands, but not the entire population of the island, surely?
We could be charitable and put it down to lack of geographical knowledge (Mesopotamia in Rutland is another example), but the censuses have apparently been transcribed by either a kindergarten class or the inmates of a lunatic asylum. Another possibility is criminals awaiting execution, who had nothing to lose by sabotaging the system. Cheap labour, either way, but at what a price!