Lat and Lon not updating on subsequent searches

When you first do a search by zip everything works and the locations appear. The problem is that if you enter a new zip code and search again the only variable that updates in the query string is “snear”. The lat (“sgeo_lat”) and lon (“sgeo_lon”) do not update so the locations are the ones from the initial search.

Example:
First search:
19711

Query string: geodir_search=1&stype=gd_place&s=+&snear=19711&sgeo_lat=39.7215173&sgeo_lon=-75.7487779

Results:
All expected locations for 19711

Next search:
06604

Query string:
geodir_search=1&stype=gd_place&s=+&snear=06604&sgeo_lat=39.7215173&sgeo_lon=-75.7487779

Results:
Same results from first search

Any help would be greatly appreciated. Thanks.