Domain is redirecting to wrong domain

I have went through and properly setup the Domain Mapping plugin including adding the custom domain with the one sub domain in multisite. I checked with my hosting company to make sure all settings were in place with the domain name including making sure that I have setup a dedicated IP address to the multisite domain.

The issue I am having is that when I type the custom domain name in it redirects to an unrelated Wordpress install which is actually the first level install off the root directory. The multisite domain is a add-on domain. I am using Host Gator.

Why is this redirecting to the wrong domain?