I have noticed this issue, I'm on Sargeras, my friend is on a lower population server, he wanted me to help him kill something, so he invited me (he's 90, just like me) and it keeps porting him to my server instead of the other way around. We've tried everything, was there an update to the cross realm zones that makes lower pop players go to the high pop server first? Or?
There is a purposeful non-specific determination in who is taken to which realm in order to dissuade large groups of people from intentionally targeting a single realm for nefarious activities. Unfortunately it does have the side effect of impacting some of the good uses for cross-realm play, like inviting a friend to help with something that exists on one realm but not the other.
