Its becuase of your forum software. Make sure you update the URL to your forum directory in the settings of your Forum. Reply back or PM me if you have any more troubles.
Doesn't really look like its an issue with the forum configuration. All the links are correct its just the URL that it takes you to changes from http://sigchatservice.com/forum to http://sigchat.torch.exofire.net/forum when you first goto it. So it basically only happens on the index.php page.
Not really sure what it is, try and check the domain configuration and redirection settings that you may have.
I mean when you first set up your forum you had the subdomain and set the url to that subdomain... now even though you have a new domain, when you go to the forum it takes you to that subdomain. You want to change it to your domain. there is no other reason this could happen.
That forum is half-coded by me. Anyway, I configured it for my domain when I set it up in the first place, and still is properly configured as you see when you hover any link. And as I said before, it was working properly before transfer and after I haven't changed any settings in either cPanel or forum config.