user registration security problem?

[funny-rabbit]

Today a customer registered on my site, but the account was gone when I checked who registered in my shop. Is there a security issue? I haven't seen any option to un-register, at least not in the admin account (which could be the reason).

[jenkinhill]

Registered as a Joomla user?  Registered as a shopper?  Which?

[funny-rabbit]

as a shopper, it must have been as a shopper because the user registration confirmation mail has the format of the Virtuemart mails.

[Jörgen]

Check index number in database and see if there is any unused number, indicating deletion.

Jörgen