If you insert a screenshot from your hierarchy I will try to help you.
xfa.resolveNodes() = The formular looks for "Row2.Exp2" and the search begins above on the first node bottom-up.
I suppose that you have more unnamed subforms. I see this if you have Row2 several times. The square bracket shows this. Then will appear this string.
Kind regards Mandy
Thx for the screenshot. But in this section I can't see where you have several times of the Row2?
I renamed the rows in the table to be numerically correct, saved, closed and re-opened the document. Then I used CTRL key to select fields I want added and all three columns work now.