Sorry to hear about the trouble. Will it be possible for you to share the link of the prototype with us so that we can test this on our end? If yes, you can share either here or through DM by clicking on my name. I'd also request you to check in full-screen view on the machines in which it's not rendering correctly or change the zoom% and let us know how it goes.
Note: While sending the DM, please add this discussion link in the subject.