It may be the search is cross-referencing anything that says "national park" and grabs US and Canadian parks.
If that is the case, it's a good thing.
I think people mistakenly think that the search is perfect and will work exactly as they "want" it to work, thinking that is how it should work.
In the ten years I have been here, that has never been the case, and IMHO, it will never be the case.
I don't think the search has to work perfectly in the manner in which all FAA sellers are going to agree it should work. I think it only has to work and be as accurate as it takes to sell a bunch of art for FAA, with no concern about whose art it is.
The thing is, the FAA search is heavily, heavily weighted to bring the top-selling images and sellers to the top of the search. It may simply be that the weighting eliminates those images in favor of better sellers.