I downloaded the old kml from iNaturalist and added the new polygon. I edited the kml file by hand to turn it into a single multipolygon (couldn’t figure out how to do it in G Earth). Opening it up in G Earth works fine. But once I upload it to iNaturalist the second polygon to the west turns into a single point nearby.
Is your ‘second polygon to the west’ the new area I’ve indicated in orange?
The small round marker icon is the ‘center’ of the place (set from the old kml place bounds) you should be able to move it west by manually editing the Longitude textbox.
I am unable to view or download that file. Anyway, I’ve had problems with multipolygons so I don’t use them anymore. Instead I manually edit the KML file so that it has a series of polygons.