Ok, you must be having all of the form fields in one single form. You are getting that comma delimited list of field values because you have 6 form fields all named with the same name: "projectName". Basically, if there are multiple form fields with the same name, ColdFusion takes their values and makes a list out of them when they are submitted.
Probably the easiest thing to do is to create a completely separate form for each row. Each form would only hold the fields of a particular row, and therefore the update button would only submit those particular form fields to your save page.