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.