Ah, sockpuppetry. My old nemesis. Well, looked at what I suspect the rp in question is and, granted, it's not unusual if they are two separate people. I have a friend on the guild who frequently recruits me via skype and he forgets to tell other people he did so. So the situation isn't implausible.

That all said, I can't find the Terms and Conditions to prove whether or not it's even allowed on the site but, if you suspect it to be the case, best to drop out before you invest a lot of effort. If it is the case, you dodge a bullet (since no one EVER makes a sockpuppet with good intentions) and leave the rp to collapse over the fact it's essentially a one-person story. If it turns out not to be the case, well, sounds like you're not going to have the best time anyhow if they make you suspect sockpuppetry is going on. Sad but true.