Invitation email has wrong link for registering

Hello. I was looking for an alternative way to invite new people to my site as the Invite Anyone plug in just doesn't seem to work anymore and was always throwing errors anyway. Until that is updated I went to the Invite plugin.

It doesn't have any upfront options such as the other one which I would surely like to request it would have. A tab in the user profile allowing users to invite people would be great.

I did a test invite to myself and the sign up link is
You can create your account here:
http://crosseyedgaming.com/wp-signup.php

I have a WPMU with buddypress site and the join link is
http://crosseyedgaming.com/register

Should it already be that ?
Either way, how would I change this?
Thanks.