I have noticed that when I open our website (voltbike.com) in a private window or on a computer which hasn't visited it yet, often the website doesn't load with HTTPS.
It is only once I refresh the page that it loads correctly.
Does anyone have experience with this and where should I look to investigate this problem?
We're running Magento 2.3.5-p1 with Securi firewall & caching and no Varnish.
Thanks in advance.