wildcard (*) subdomain and IP address

Dear Sir,

I try set up multi-domain plugin.
My main site IP, I have point all the top domains to this IP and add an A record .
But when I Create a New Account at WHM, and add * subdomain, the domain/site
automatic goes to my main IP

The problem here is that WHM is routing the domains to different accounts, and therefore different IPs.
not go to my main site IP

Now my main site have
"Warning! Wildcard DNS for domains.COM may not be configured correctly!"

What is the best solution to solved the problem.