ok, the session is being set correctly.
I did a quick test with your eCart object file, setting the shipType session to "same" and the shipping was added to the cart display.
This suggests to me that the cart object file on the server is not the same as the one you sent. try deleting the cart object file from the server.
to make sure it is being deleted, try accessing the confirm page, you should get an error or a blank screen, then re upload the cart object file and try again.
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