I realized that you add to your data sources two pairs of latitude and longitude trying to draw boxes on the map.
I suggest a simpler approach that is having the Latitude and Longitude of the place on the World Map and use the measure count to create a graduated symbol map, then in Marks select Square to represent squares instead of circles on the map.
Take a look a the attached workbook. I use the measures minlat and minlong as centroids for item locations. Don't forget before to assign the geographic role of latitude and longitude accordingly.
You also are able to use shapes to show rounded box or any other shape on your map.
I search on Internet and I found a rounded box (attached) and I save it on the folder My Documents/Tableau Repository/Shape/Rounded box
Notice that the folder Rounded box was created by me.
In Tableau, I change the Marks to Shape and clicking on Shape you are able to select the new shape (rounded box) added.
Check out the attached workbook to see the result.