Advanced Custom Fields and Gravity Forms

I have a form set up that creates a pending post. The form includes checkboxes which seem to be stored in an array just fine when selected and echoed into the post. I am using Advanced Custom Fields so that once the users post is published, they can log in and make changes to their post. The problem is that Advanced Custom Fields stores a reference value along with the actual value of the checkboxes. So when the user goes back to edit their post, only one checkbox is selected rather than the multiple they may have picked. I think there may be a way to fix this using Advanced Custom Field's update_field function, so that when Gravity Forms writes information to the database a "reference" value is passed along with the usual post info. I cant seem to find where, in the Gravity Forms Plugin, the php file is that writes the post information to the database.

we can close this one