The “top line” of a sermon document is randomly disappearing - With 9.15.0 on iPad

Normally a sermon document looks something like this

But this morning, as I was preparing to preach, the “top line” was missing and looked like this

The only way I could find to regain normal functionality was to kill and restart the app.

Then 20 minutes later I noticed the same thing had happened again and I needed to restart the app.

This did happen about three weeks ago (I haven’t used the app for preaching since then until today).

Is there a known issue here or is it something that needs to be looked at?

Thanks, Graham