I created an answer bag account the other day and someone has stolen my email on the site somehow.

I created a new answer bag account with my apple I.D. Email address the other day. I can use this address anywhere else but suddenly on answer bag it's saying it's invalid. I thought well maybe I used the wrong address (which I was sure I didn't), so I tried my google account address and that also said invalid. Now what's weird about this is I only HAVE two email accounts! I was happily using this site but had only just created my profile on it and when I tried to log in again this is the weird problem I'm getting. Help.