Hello,
since I had little time to solve the problem after many checks the solution was a full server reinstall, so I can't reproduce the issue now.
However, more calmly, I've found that the main server IP is written (also) in
/usr/local/cwpsrv/conf/httpd.conf
/usr/local/cwpsrv/conf.d/cwp-ssl.conf
I don't remember if I've tried to manually edit these files but this can be a thing to check if someone has the same problem.