WPF Diagram Export to pdf,shape border deformation

[wu]

When adding a graphic to the diagram, adjust its width and height, and set the border to 2（or other value）

After exporting the PDF, the thickness of each border is inconsistent.At the same time, the thickness of the border is also different from the set value,I feel like the border has been stretched and enlarged as a whole,You can test Microsoft Visio, it doesn't have this issue.

      Test code use the sample sdk project:ExportToPDF_WPF

Please refer to the image