IPv6 keeps dissapearing

It happened today again... When I checked the website with a browser, it went to the default page.

Looked at the vhost conf files, and the IPv6 that was manually entered was GONE, AGAIN.   

Running CWPpro 0.9.8.1026 on CentOS 8.3.2011

well you need to create your own custom template and apply it to your user domains, in this way changes will be retained.
http://wiki.centos-webpanel.com/webservers-vhost-templates

well you need to create your own custom template and apply it to your user domains, in this way changes will be retained.
http://wiki.centos-webpanel.com/webservers-vhost-templates

I see "%ip%:%apache_port%"

Where can I find what to put to IPv6?
Would it be - [%ipv6%]:%apache_port%

Did the custom template, after restarting, the IP vanished again.
So I hard coded them into the template.

Problem is, I can access the IPv6 OK, but others can't.

I tried to even disable csf/lfd and Mod_Security to see if there was a config problem.
There are no other firewalls in place.

Others still can not connect to the IPv6.

I'm out of ideas now.