repeteable group doesn't work correctly

[gapper]

I have a form with user element and a dropdown element. These two elements are into a repeteable group.
When I add only 1 record (without using the Add button of the group), the list shows correctly the username in the list.
When I add 2 or more records (by using the repeteable group), the list shows 0 in username column for the added records.

 

[gapper]

I have found a way to let work user element and repeteable group together in a list correctly.
I have used the procedure in one to many tutorial with join and it works correctly.