Https Redirect Issue with NGINX

I have a rather bizarre problem here.

I have several sites on the same server running with Nginx; only one has HTTPS certificate and the other does not. The problem is that if a client enters the site without the certificate and places HTTPS in it, the site is redirected to the domain that owns HTTPS.

It seems to me that some default setting is doing the redirect to the HTTPS site and I can not figure out the problem.

Can someone help me???