Thank you for your question. I confirmed your SSL is installed successfully, by using an online SSL checker.
Then I successfully tested your website by adding a product, and proceeding through checkout via paypal. I was not able to replicate any session expired issues. Since the checkout is with paypal, what URL is the "session expired" error occuring on?
Have you tried clearing your browser cache.
If you have any further questions, feel free to post them below.
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