Multiple Repeat Regions create Selection error

Hi there
I'm new to WA products so please bear with me. I have an admin page created in Dreamweaver CS4 in which I'm using DataAssist Repeat Selections.

One part of the page is a submission form which contains a repeat selection comprising of a standard form drop down menu (named 'driver_id') which is dynamically populated and a couple of text entry fields. I've then applied an Insert Multiple Records behaviour to this repeat selection (creating 6 versions of this selection) and it all works beautifully.

The problem occurs when I add a second repeat selection elsewhere on the page to display a dynamically populated list. For some reason, when I do this, the first of the dynamically populated drop down menus in the form mentioned above loses its content. The other five duplicates of the drop down are populated fine, but the first one is empty.

I've looked through the forum and found something fairly similar which mentioned displaying a hidden field like...
<input type="hidden" name="driver_id_hidden_<?php echo $RepeatSelectionCounter_1; ?>" value="1" />... directly after the field which is the problem, but in the same cell,
and then replacing "driver_id" in the WA_loopedFields with "driver_id_hidden". I tried this, but unfortunately it didn't resolve the issue.

I would be grateful for any assistance.
Kind regards
Paul