Course presentation not scaling properly on mobile app

Hello, I'm using Course Presentations on Wordpress.

All working brilliantly except when the presentations are viewed within a mobile app (I'm using Apppresser), items (I think it's just text font size) don't scale properly leading to items not fitting properly on the screen and vertical blue scroll lines appearing on the text fields.

Apppresser allow me to view the app on a browser preview and it all looks fine there, just not on an actual device. This makes debugging quite difficult, although values can be outputted via alerts from h5p.js

Perhaps it's an issue with the parent frame(s) that it is in? Although I'm surprised it is only happening on actual devices.

The issue is present on both IOS and Android. I would really appreciate some help on this if anyone has any suggestions.

I attach some screenshots.

Thanks, George