If you see a PDF icon, the pdf's are there, their contents are simply not displaying as you expected.
You can test this by using export field contents to export the contents of the field to your desktop.
Thank you for your response, but it doesn't help me. I know the pdfs are there since I see them on computer 2. What I need to know is how to be able to see them on computer 1.
On the two computers, check what adobe plug ins and versions are found installed in Safari (macs) or explorer/edge (windows).