Changing Lead Source Data Value when filling in a Form

Hi there,

I have created a flow so that when a form is filled in on a specific landing page, it changes the data value of "source" so that value from that landing page. It works fine the first time someone fills in form the only problem is if someone fills in a form on a different page it doesn't update the "Source" this is something that I would like. Any recommendations?

Smart List:

Flow:

Kind Regards,

Mason