Thank you for additional information.
I checked your source document. The problem is not reproduced on it.
But I managed to reproduce the problem on documents you have given. I have attached your documents to the corresponding request in our defect database. As well as I'll include your request in my monthly report, it will increase the priority of the bug. Sorry for the inconvenience.
Kind regards,
Viktor Kazmiruk
Technical Support
Aspose Auckland Team