The observations associated with Travis county, TX that are mapping outside the county boundaries are obscured observations with true coordinates located inside Travis county. The boxes that emerge here are the 0.2 x 0.2 degree cells within which a random location is assigned for mapping purposes. If you zoom in further, you’ll see the markers that lie outside the county boundary are different than most of those within, indicating that they are not showing a precise location.
You can read more about different types of geoprivacy here, or see the details for a specific observation by clicking “details” below the map view, e.g. for this obscured Travis county moth.
Housekeeping note: I’m moving this to its own thread since it’s not directly related to the new type of map display.