So you didn't finish up registration first time, but it remembered your data when you tried from a normal browser?
That's what I assume, because I got a message saying that someone had already registered from that IP address. And of course it wasn't the IP address, because I had never registered before and Tor's IP address was completely different from mine.
When I tried Tor, it asked me to complete some captchas that I couldn't, and then with the other browser it didn't ask me.
As it was said, glad you've it popping up before getting the need to withdrawal or something else.
Curious what their support would say..