There's a possibility that your store has a flaw in one of its add-ons or database to show that kind of action (at least with an oscmax store). 2.025 doesn't do that by default. When you try to attempt a second account with an email address already in the database properly, you'll get an error message that says...
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Your E-Mail Address already exists in our records - please log in with the e-mail address or create an account with a different address.
and will be prevented from finalizing that second account. I would recommend trying to mimic the activity on a clean installation (test site) and see the difference...
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