The Repeating table behavior is intended to create a grid layout.
lets say you had a recordset that returns 3 column and you want to show a grid layout of the results using a layout grid where after 5 columns, it creates a new row.
in each cell you would display the 3 columns that are returned by the recordset. You could add a table to the repeating sell to layout how the data is displayed.
I think what you are trying to accomplish is a standard repeat region, not the repeating table behavior.