I recently found a "?" cache (GC3VGHX). The posted coordinates are on the ocean, the cache page shows it as New Brunswick (Canada). The solved coordinates are also in New Brunswick. However, on the project GC checker for a challenge based on icons in provinces does not show the find of the "?" icon in NB (so I assume it's treating the cache as being in PEI).
Similarly, I know of a traditional cache on a mountain (GC9DN1W) that the cache page states as British Columbia (which I believe is correct) while the project GC page lists the same cache as being in Alberta (highest cache in a province). Yes the mountain in question straggles the border, but from what I know of the cache location, it is on the BC side of the border.
I'm curious about the inconsistency.