Hi Nate,
Thank you for your update.
We are not able to reproduce the mentioned issue from the sample provided by you. We have tried your sample with 8.3.0.20, 8.2.0.18 and 7.4.0.20 versions of dll. Could you please find the generated document from the below link. Please view the document and let us know if this helps. If the issue exist, could you please provide us with the information about the Essential studio version and MS office version you are trying to reproduce this issue.
Generated document:
http://www.syncfusion.com/uploads/redirect.aspx?&team=support&file=Sample-1127866136.zipPlease let us know if you have any questions.
Regards,
Poornima