Hello, that is because we also use SSL, here is a resume of what SSL is:
SSL = HTTPS
NO SSL = HTTP
“SSL (Secure Sockets Layer) is the standard security technology for establishing an encrypted link between a web server and a browser. This link ensures that all data passed between the web server and browsers remain private and integral. SSL is an industry standard and is used by millions of websites in the protection of their online transactions with their customers.”
Find more here: http://info.ssl.com/article.aspx?id=10241
As you can see in he screenshot, even Google has it, but the identity is verified, so you just have to talk to your hosting provider to configure your SSL so its verified and the locker changes to green. This SSL is a way of telling your clients that the website is secure and verified. It doesnt mean that you cannot have a secure website without it, is just a kind of official certificate to help encryptation.
If you dont want to use a SSL (may conflict with some plugins) Talk with your hosting provider so they can guide you.
Actually we have no power on that so i cannot do much more for you.
NOTE: In case you didnt had this SSL before, check out your plugins and make sure that there isnt a “Force SSL” option enabled.
Hope it helps 🙂