Plaxo changes contact names in outlook

I noticed the other day that my wife's contact information has been deleted from my contacts folder. I assume that Plaxo saw that her e-mail address is the same as my home e-mail address so it changed the contact name to my name. Anybody else have this problem. I had to delete my home e-mail address in order to keep her name as a contact. It kept changing her name to my name and adding my work information on her card.