Form on PURL page is not updating correct user record

[Kaye_McClendon]

Hi, 

I have a PURL website that has dynamic content based on the known user (their name is in the URL). On page load, it recognizes the correct user because it has their name on top banner (via tokens).  The problem I'm having is that when I fill out the form, it is creating a new record in the database, instead of updating the known user's record. How do I resolve this?