Mapped Domain using Multisite losing the www from the mapped domain

I have http://www.haitigospelfund.com mapped to our multisite wp installation and have an A record and "www" CNAME record set to the IP address of our domain. When I type the full http://www.haitigospelfund.com into the address bar, the site comes up, but without the www subdomain. Rather it just shows as http://haitigospelfund.com.

Is there anyway to get the full domain with the "www" to show up on the address bar?