Clients getting a "Couldn't establish as secure connection" screen, any fixes?

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Website works perfectly fine for me (I'm using Google Chrome on my laptop), I've gotten my brother to test it out and it's dodgy apparently on Safari, and my friend tested it out on Opera's and Google Chrome's mobile apps (Opera failed, Chrome worked on regular tabs, incognito was a no go though.) I'm currently trying to work out my first sale, but the website not loading has made it currently impossible, any suggestions?