iNaturalist does intentionally limit the number of species that you can scroll through, as @pisum described. In general, filtering down to a smaller number of species (e.g. taxonomically) is recommended whenever you’re running up against iNat’s limits for performance purposes.
Since this isn’t a bug, I’m going to reclassify it to General and rename it from “Species shown inconsistent to species reported” to “Trying to view large numbers of species in Explore” so you can continue the discussion if needed.