On most stat pages, there is now a region called 'South West England' and a region called 'Southwest England'. The first one does not show a map in 'Map Counties'.
I noticed while browsing someone else's stats, that they had found '15 of 14 regions' in the UK (108%). Oddly, there are only 14 Regions listed for the UK in 'Map Regions'.
Obviously it's a bug, but whether it's to do with Project-GC, or whether it's a bug in the OpenMap data, I don't know.
Looking at 'Top Logged caches', there appear to be only two caches in that region, and from looking at those, it appears that the 'Region' is in the sea to the north of Southwest England. I suspect therefore, that it's an issue with the OpenMap data.
EDIT: I've also just noticed that there is a region called 'South East England' and another region called 'Southeast England'. The former has just one cache in it, which appears to be located some distance south-west of Africa. Now that's odd...