Domain Check Not Validating

I have the whmcs integration installed and it is starting to kind of work..

buildachurchwebsite.com/client-area.html

But when you go to order something and you have to validate the domain to order it or transfer or whatever it just reloads the page...

If you go to the domain without the integrator it works like it is suppose to

buildachurchwebsite.com/clients

So there is some issue between the integrator and wordpress which breaks the url validation..

This has be out of business.. please help!