orovio on "Webpage has expired"

I am getting "Webpage has expired" from IE and "Document Expired" from FF.

It only happens after the selection of a filtered product and then hit the back button:

For example, in Internet Explorer or Fire Fox
1. http://elusivetonewoods.com/savagewoods/product-category/inventory/exotic-wood/ziricote-exotic-wood/
2. check any filter box
3. click on a product
4. click browser back button

Any body dealt with this before?

I am guessing it has to do with Post or Meta Data and the specific browser not caching "sensitive" docs....

Thanks!!