I'm using the Premium Responsive Design Felicity (PHP) and when you add items to the cart, then hit check out sometimes they don't show in the cart. Update the browser windows and sometimes they will show.
At first I thought it was a browser issue till I had a customer tell me they are having the same issue.
Also, when you items to show up and delete them in the checkout window, when you go to check out later they are still there until you refresh the browser window.
A few things to check. Make sure the site is not changing between www and non www versions of the URL. Also that it's not going from http to https back and forth. If it's not those, ask your host to check the session variables on the server. That would be the likely culprit if you have your URL's consistent.
Hi, there is a good post here from Sinbad regarding setting up your site for HTTPS https://www.ecommercetemplates.com/support/topic.asp?TOPIC_ID=106851 You should be forcing all pages to https via the htaccess file as described in the 2nd post there.