I have two tables where the child column feature does not work properly. In one case the all but one of the columns set to be child columns, works OK. The first column on the child list remains on the main part of the table. In the other case, none of the columns in the child list show up as child columns. In other words, the green dot with the + sign does not even show up not the table.
The path to the first problem is:
wmb.elginroots.com/index.php?option=com_content&view=article&id=120&Itemid=191
The last column should be included in the child list.
The path to the second problem is:
wmb.elginroots.com/index.php?option=com_content&view=article&id=121&Itemid=192
The last 7 columns should be in the child list.
This is a test site and I can give you access to the back end.