Station ID Changes during Hourly Reads from API

The Station ID changes for every hourly read that we receive for a some Lat/Longs.

What causes the station name to change this frequently (every hour read) where the station name increases by 10 for each read?

Ex.
Lat: 32.4531912
Long: 139.7697725
http://www.wunderground.com/history/s...?

Station Names returned from the API with local time for the weather read:
19164 - 9/20/2014 1:00 AM
19174 - 9/20/2014 2:00 AM
19184 - 9/20/2014 3:00 AM
19194 - 9/20/2014 4:00 AM
19204 - 9/20/2014 5:00 AM

Since this is a small island, it appears that the only station available is at the airport.