I’m moving this to the Feature Request from the Bug Reports forum after it was pointed out to me that this is a known design choice. That post is here: https://forum.inaturalist.org/t/discrepancies-between-range-maps-on-website-and-mobile-app/13495/3 .
Basically, the iOS app displays captive observations in the range maps by default, which greatly obscures/skews distributions for anyone looking for distributional information in the app (e.g. when deciding if a species that one is uploading is found in that region).
Screenshots comparing the range maps on the app and the website are below. The additional observations from Arizona and Europe are of captive observations. The species is endemic to Baja California Sur.