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I tested your root domain with the HTTPS prefix and it came back with an error:
That leads me to believe that your SSL cert is not installed correctly. Could you verify that this is, in fact, installed, because I don’t think this has to do with Magento.
Also, if you have a shared SSL cert, please let us know, and some more information would help (who is your hosting company, or is this hosted on your own server, and what kind of SSL do you have, etc.).