this is more of a data problem than a problem with the way the system is working.
the positional accuracy values for these observations is very large (>36km). so the system treats these as mappable=false, and they will not appear on the map.
see https://forum.inaturalist.org/t/my-observation-doesnt-appear-on-the-map/32724/4 for more information. probably in your case, you’re manually selecting the entire park as the location, and because this is a large park, you end up with a large positional accuracy value. so ideally, you would want to narrow down your location more.