AEM 6.2 CFP4: Submit has ns2 on tags

We installed AEM Forms 6.2 CFP4.

Our submit has ns2 on the xml. Any idea why? Seems to be something to do with panels.

XSD has no mention of "ns2".

"=============================="

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

<data xmlns:xfa="http://www.xfa.org/schema/xfa-data/1.0/">

  <ns2:Metadata>

        <ApplicationId>2</ApplicationId>

        <ApplicantId>1</ApplicantId>

        <FormName>name</FormName>

        <SectionName>section</SectionName>

      </ns2:Metadata>

  <ns2:PrimaryName>

        <LastName>me</LastName>

        <NoGivenName>false</NoGivenName>

        <GivenName>me</GivenName>

  </ns2:PrimaryName>

...

</data>

"=============================="

Appears to be with JDK jdk1.8.0_92 (my machine). Doesn't occur with jdk1.8.0_74 (another machine).

But we doubt the JDK is related.

Also doesn't seem to occur on my machine when I don't do a prefill.

-Joel