Misdirect Request

I have a domain with two subdomains. If I click on one of my "Online Classes" link from the menu bar on my https://nurturance.net domain using the Safari Browser I get a 421 "Misdirected Request

The client needs a new connection for this request as the requested host name does not match the Server Name Indication (SNI) in use for this connection.

Apache Server at courses.nurturance.net Port 443"

It seems to be fine if I type the web addresses directly in the Google URL bar. I think it's only an issue when I click from one of my sites to another one of my sites.

I have single SSL certificates for each site, as was suggested by Hostgator and others to fix the problem but it didn't fix the issue. I've cleared my cache and turned off a feature inside Safari known as Prevent cross-site tracking but I'm still having the issue. Someone suggested it may be a security feature I have personally set in Safari, but I'm not sure what that would be. Could someone see if they could recreate the issue so that I can tell if it's something in my personal settings or if it's happening for others?

I'm using Safari 13.0.5