Your website doesn’t force SSL
The link you put in this forum post is to the Non SSL version of the website
Works fine if you visit it on https://djnipperoldskool.club/chatnet/twitch-test instead of http://djnipperoldskool.club/chatnet/twitch-test as you linked
So you need to make sure you force people to the SSL version of your website. Either with Apache/Nginx rules (recommened) or via meta refresh/client code