Zend certified PHP/Magento developer

All browsers automatically append subdomain names to URL upon pressing enter while using address bar

I’m trying to access a subdomain I just created by typing dev.mysite.com into the address bar.

When I press enter, each browser I tried(Firefox, Chrome, Edge, Chrome on Android) does the same thing. It tries to access the site dev.mysite.comdev and I have to manually remove dev from the automatically generated URL.

I’ve no idea why this is happening and did not find a single bit of info on the internet related to the issue. I’ve tried messing around with the preferences in about:config for Firefox(switching browser.urlbar.autocomplete.enabled, browser.urlbar.trimURLs and browser.fixup.alternate.enabled to false), but nothing solved the actual issue.

Using other subdomains, for instance, maps.google.com, works just fine.

Am I missing something really obvious here?