Table in DOCX looks different in PDF documents

I created a document with Microsoft Word and I exported it as PDF. When I opened the DOCX document the table border looks ok, but when I open the PDF the border looks different, in gray color.

See the screenshot, in the left side, is the DOCX document and on the right side is the PDF document.

Screenshot: table-looks-different-in-word-pdf.png (50.3 KB)
DOCX: gd21-link-table-encode-docx.docx (23.7 KB)
PDF: gd21-link-table-encode-pdf.pdf (182.2 KB)

Git project: GitHub - groupdocs-viewer/GroupDocs.Viewer-for-Java: GroupDocs.Viewer for Java examples, plugins and showcase
Git branch: master
Git revision: f75a0b7
SO: Windows 10
Java version: Oracle JDK 1.8.0_201 and Redhat OpenJDK 11.0.10

This topic has been moved to the related forum: Table in DOCX looks different in PDF documents - Free Support Forum - groupdocs.com