A quick look at groundpeek forum results in this thread.
For some reason groundspeak tags all caches on the island of Irland as the "country" Irland. It has been this way atleast since 2012 and i have no idea when is started.
It is the first time I have noticed that a groundspeek "country" is a combination of to different countries.
The other way by splitting a country in different parts is quite common.
Both for areas with some special status near the like Aland Island and non special parts far away like French overseas departments.
Other split islands is different countries. Even the small
Groundspeek is relay inconsistent with the geographical divide.
If Ireland is on "Country" Why is Saint Martin split in the St. Martin and the Netherlands Antilles? The other parts of Netherlands Antilles is quite far away
If a country has smaller division and the size/political level of the is also strange.
Sweden is divided in 21 län but Finland is one big area even when län exist. They are created at the same time when Finland was a part of Sweden.
If I am not mistaken the county is taken directly from gc.com but the State(region) and county is calculated on pgc
But the map rendering on PGC is a bug. UK is rendered correctly as the groundspeek shape but Irland is renderd as the Republic of Irand and note the groundpeek Island of Irland
I guess there has been a polygone update on some area
Is there a border between Northern Ireland and Ireland on your map. Depending if it exist or not you can see which is updated incorrectly.