Look into the following things...
1. Select the DataRow for the table in the hierarchy. In the OBJECT palette, select the BINDING tab. Verify that "Repeat Row for Each Data Item" is selected. Check any of the other three tabs as needed.
2. Check that the subForm in which the table resides is set to "Flowable". If it is not or your table sits in a subform with many other things, you may have to do some rearranging. Usually you can make a flowed subform appear like your positioned layout using margins for your objects.
3. Check your script that parses through the XML. Is that even how you are doing this?
I just did the exact same thing in the project I am working on now, so if you have any questions, reply or email me at firstname.lastname@example.org.
Hope this helps!