Issue with search and the back button

Greetings all,

Deb and I are putting her site through the final testing and we have discovered an issue with putting in the zip code for one state the search box, being served a listing result, using the back button to return to the home page, putting in the zip code for another state and getting only the listing result for the previous state.

We also noticed that if we enter in a zip code for a state where we know there is no listing and get the “No Listings Found” message, then use the back button and enter in a zip code for a state where we know there are listings, we stil get the “No Listings Found” result. That makes us concerned.

We are trying to think of all the ways customers might use the search! Would this be a caching problem?

Would you kindly take a look? I will provide all the info below.

thanks!

Suzy