Thanks for considering Aspose.Pdf.Kit.
I tested your templates with the newest release V22.214.171.124 on my platform. Everything is OK. Please check your code according to the following code.
Form form1 = new Form("NABTEST.pdf");
System.IO.FileStream xmlOutputStream = new FileStream("NABTEST.xml", FileMode.Create);
//Import also OK
Form form2 = new Form("NAB-ORG.pdf", "NABTEST-filled.pdf");
System.IO.FileStream xmlInputStream = new FileStream("NABTEST.xml", FileMode.Open);
The output file is also attached, please check it. If the problem remains, please post it here in intail. We will help you until it works.