PowerPoint Report Package PDF output has gray borders for embedded content

Hello,

When we create PowerPoint Reporting Packages we are noticing a gray border around embedded content.

For us, when we have a PPTX doclet that uses embedded content from an Excel reference file, the PDF output (downloaded locally) has gray borders from that content. It's always the same objects but not all embedded content from that Excel reference file has the border. It's not in the original PowerPoint and not in the Excel reference file that we can see. In the Excel file we formatted the cells lines around the name range with no luck.

Anyone encounter this? Thanks in advance.