Open up safari on both computers and check to see what adobe plug ins are enabled. I suspect that you'll find a difference there between the various computers where you are getting different results from the same PDF on the same record, same layout, same file.
Interesting. I was not aware safari was involved in this process.
Does that make me a fool?
I learned from TsGal--who works for Filemaker Inc, that interactive containers are really special purpose web viewers. They don't use Safari precisely, but they use a 'web kit' that comes from Safari on Macs and from Internet explorer (Edge?) on Windows machines.
I've seen a number of threads reporting issues with PDF's that traced back to what Adobe Plug ins were present and enabled on that particular computer so this would be the first place to check for something that explains the machine specific differences that you are reporting.
Would this be related to Adobe Flash? That is the only adobe plugin I have in safari