SSL error

Hi all,

I have a website on the provided URL. But domain is hosted at namecheap.com and hosting is somewhere else. On hostingside I could usually fix an SSL certificate with Lets Encypt and it works then directly. But now I can’t do that in Direct Admin; it gives issues (I guess because of the domain outside).

I’ve tried to enable SSL in WordPress with Really Simple Security. That gives SSL with a green check mark. But site gives:

www……..com usually use encryption to protect your information. This time, when Chrome tried to connect to www……..com, the website returned unusual and incorrect credentials. This can happen if an attacker tries to impersonate http://www.easytabular.com or if a Wi-Fi login screen has disconnected. Your information is still protected because Chrome terminated the connection before any data could be exchanged.

You can’t visit www……..com at the moment, as the website uses HSTS. Network errors and attacks are usually temporary, so this page is likely to work correctly later.

What can I do now? I’ve tried a lot to fix it but don’t know where to start. I’m now just guessing around.