Checkbox problem in Aspose.PDF ver 6.5

We have a web form which contains some checkboxes. We retrieved the information from the backend database and generated the corresponding PDF file. In the generated PDF file, there are some checkboxes. All the checkboxes work well in Aspose.PDF before version 6.5. After upgrade to Aspose.PDF 6.5, the checkboxes displayed twice in the generated PDF file, once on each page. I stepped into the code, the code that produces the checkbox was only executed once. Not sure why it displayed twice.

Please note there is no problem in version 5.0, 6.4.

Please see attached files for your references.

Any helpful info is greatly appreciated. I am getting frustrated!

Rose