Fit to page doesn’t work reliably iOS app

iPad app 29.1.1

The fit to page feature often shows the zoom level too low, resulting in a massively zoomed out view. This automatically happens every time I change pages too. That means I have to zoom in every time and is a huge PITA. If I force close and restart Express, it will often work ok but at some point, it'll stop working correctly again. The zoom behaviour is also not great in that you can't pan the page left and right, it's stuck on a vertical centre line off-centre. That means I can't move the page view around exactly where I want it.