InDesign 16.4

When i publish a document using 'publish online' it doesn't work correctly on mobile. When you first load it up on mobile the navigation bar at the bottom is there, but if you click anything on the page the navigation bar disappears. This then means you can't navigate through the rest of the brochure.

I've tried this on multiple mobile browsers including Chrome, Edge & Brave and the same happens on each.

This is a major issue for us as a lot of people will want to view this document on mobile.

I've attached a couple of screenshots

Thanks