We are unable to reproduce the issue from our side. We have shared a simple sample for your reference which can be downloaded from the following location.
Sample link: http://www.syncfusion.com/downloads/support/directtrac/general/ze/SampleCore-5589288.zip
Kindly modify the sample to reproduce the issue and share us the modified sample along with the issue reproducing input files which will be helpful for us to give you a prompt solution at the earliest.
Please let us know if you have any concerns.
Regards,