Thanks Liran for your quick response.
This has resolved point 1, the instruction and Round buttons are now working correctly on mobile, and in the mobile code there are now no lines of code underlined in red.
However, the issues with the input boxes and submit buttons (points 2, 3, and 4) still remain.
For example, when clicking in the properties panel, you can see that input boxes are ticked collapsed on load in desktop view by unticked (and greyed out) in mobile view.