Navigate back with PHP form submission

Question

So here's how it works: I use PHP script to construct pages based on data entered in HTML forms to transfer variables from one page to another. In general, it works like this: you choose the item from the catalogue, and then specifics for that particular item are displayed on the next page. Everything is flawless, but for one thing:

I always receive the ERR CACHE MISS message when I press the back button on my browser, and I have to refresh the page and then confirm that I actually want to resubmit the data.

Is there a workaround for this that would allow my consumers to just utilize the back button as they should?

Here is the full text that the browser provides me:

This webpage requires data that you entered earlier in order to be properly displayed. You can send this data again, but by doing so you will repeat any action this page previously performed. Reload this webpage. Press the reload button to resubmit the data needed to load the page. Error code: ERR_CACHE_MISS