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Level 9

I tested your form and was able to duplicate the behaviour you described.  I also opened the form in Designer and removed the "Acrobat" reader extensions, as you described, the form displayed the items in the drop down list only once.  I then applied the "reader extensions" to the form using Acrobat and the  form displayed the items in the drop down list with duplicates.

I then tested a version of the form where I "Reader Extended" the form using LiveCycle Reader Extensions ES to apply the rights and the form continued to function correctly (form displayed the items in the drop down list only once).

I don't know why Reader Extensions applied with Acrobat causes the problem, but it seems to be the source of the issue.  I would recommend that you log this issue with Adobe Technical support for further investigation.

Regards

Steve