Not sure what you are asking
If you are asking how this happens, I have already stated but see below the steps.
1. order item on http address.
2. item goes to cart at http address
3. click checkout button
4. item goes suppose to go to https checkout page but redirects and goes to shopping cart and says "empty cart"
(As I said in above post, I used the tutorial for the http to https)
All the other shopping cart buttons work when they go from https to https.
so it is only http to https. the domain name does not change.