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I am a new member so would like to say hello to everyone.

I have a question that i hope one of you can find the answer:

My partner has been receiving invitation emails from an inappropriate dating website. It seems that someone has signed her up on there and created a profile although this cannot be accessed by us because we dont know the password to the account. Also included are links to persons that are interested in her profile.
There is an option to 'unregister' from the site. When we have clicked on this link and began to type in her email address, the automatic suggestions bar begins to shown another persons email address as well. This person has never had access to our PC so how come the address is shown and could the address belong to the person that 'signed' my partner up to the site?
Any help would be gratefully appreciated.