@Anh I'm having a similar issue to this...
MB User Profile
MB Front End Submission
My form fields are appearing, but...
1) Users don't have the option to edit from where they left off. It creates a new post every time and deletes previous information
2) I have User Registration fields mapped to 'Users', and a separate form as a "User Profile" mapped to another post type ( I'm using WPFacet and have the MB fields mapped to their UPT Users Post Type that makes Users searchable.) Every time I update the User Registration form fields it wipes the information from my 'User Profile' fields.
Help is super appreciated!