Exporting as PDF - black lines around some images

Trying to export a single (long) frame as a PDF (it’s a case study) but some of my images that have been brought in as PDFs are showing black lines around the edges. Is there a way to get rid of this? It looks untidy and unprofessional. These lines are not shown in the Figma file - only when exporting to PDF.

note that this is not black boxes around links - I had come to learn of this problem while trying to search for a solution for my problem.

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