Using a place gives incorrect search results

General
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1

I’m trying to confirm the distribution of a group of trilliums in western North America using a place called Western United States and Canada. As far as I can tell, that place (65360) includes two Canadian provinces (6834,7085) and eleven U.S. states (40,14,34,22,16,50,9,10,52,46,15), so the following pair of queries should produce similar (if not identical) results:

All observations of Trillium subgenus Callipetalon in Western United States and Canada
https://www.inaturalist.org/observations?place_id=65360&subview=map&taxon_id=1413207&view=species

All observations of Trillium subgenus Callipetalon in Alberta, British Columbia,Arizona, California, Colorado, Idaho, Montana, Nevada, New Mexico, Oregon, Utah, Washington, Wyoming
https://www.inaturalist.org/observations?place_id=6834,7085,40,14,34,22,16,50,9,10,52,46,15&subview=map&taxon_id=1413207&view=species

The previous two queries return 32,402 and 32,602 results, respectively. I’m wondering why the query using the place returns significantly fewer results? TIA

2

The boundary of “Western US and Canada” is rough and excludes a couple chunks of the states and Canada.

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A small but observation-dense slice of California is excluded in particular.

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Thanks for looking. I’ll probably not use this place.