If you are getting the rite number of records updated then it seems that it is mostly implemented correctly. In your multiple update server behavior when specifying the field that the column gets its value from did you choose the repeated value? After the repeat selection is applied to the form element you should be able to choose it as repeated element from within the wizard.
If you can please post back with a copy of the page in it's current status zipped up and attached to your reply. I can examine the page to see if I can spot a reason for the problem you are experiencing.
