In specific situations, a paragraph in a table cell which is last on a document page is not exported to the PDF document.
Possible workaround is adding a new paragraph to the last table cell before exporting the document.
For instance:
BlockCollection footerContent = this.document.Sections.First().Footers.Default.Blocks;
Table footerTable = footerContent.First() as Table;
footerTable.Rows.Last().Cells.First().Blocks.AddParagraph();