This is not an issue.
Did you originally sign up using your social media account?
If you originally signed up with Facebook, the email will be the same email to which you log into when accessing those accounts. If you try to create an account using the same email, our system will recognise this and tell you that your email is associated with another account.
Alternatively, if you're unsure of what email address you signed up with, or are getting an 'Invalid username and password' message, please raise a support ticket so we can look into it and get your account up and running as soon as possible.