Insistent cgi-sys/defaultwebpage.cgi in all domains

Hi, I'm a designer trying to manipulate a server with whm, which makes it clear that I don't have very low knowledge. I have changed the IP of my VPS for a Floating IP, I have updated the IP in WHM and updated the IP in the DNS, but the redirection from www.mydomain.com/cgi-sys/defaultwebpage.cgi it is unavoidable. Can someone please help me? I don't know how to fix it, thanks!