Odd nested <xfa:data> nodes in answer files exported from an XFA

[DidntEatHisGreens]

On most documents we have developed our exported answer xml files look like this:

<?xml version="1.0" encoding="UTF-8"?>
<topmostSubform>

  <txt_int_client_forename/>

  <txt_int_client_middlename/> etc...

However, occasionally they come out like this:

<?xml version="1.0" encoding="UTF-8"?>
<xfa:data xmlns:xfa="http://www.xfa.org/schema/xfa-data/1.0/">

<xfa:data>

<topmostSubform>

  <txt_int_client_forename/>

  <txt_int_client_middlename/>

Why are these additional nodes being inserted, please? It would be easier to use the data files if we could keep the top level nesting consistent.

Thank you for any advice.

[Test Screen Name]

Am I right that this is a form made in Designer (LiveCycle Designer/AEM Designer)?

[DidntEatHisGreens]

Yes, Livecycle designer.