In my experience this sounds like an issue that should be reported to your IT staff so they can report it to Instructure for help.
The only issue I have had with Speedgrader that was similar to this was caused by a browser extension, it was an ad blocker and is a known issue. So unless you have the same browser extensions and ad-ons on all of the devices you used, which seems unlikely, that's probably not the cause but needed to be mentioned. Also, you should make sure all of those browsers have been updated.
Can you share what types of questions were on the quiz? Was it a simple multiple choice and true/false type quiz, or were there more complicated type questions such as a file upload or essay? Is this a new quiz or classic quiz?