Usually they appear in title bars and message boxes.
I've experienced this in Survey123 on iPad (3rd) and just today on Survey123-Connect on my MacBook (see screen snap below). I have an iPad Air (2nd) that I have not experienced this on. I can't recreate this, although in general it seems to happen after I do "a bunch of stuff", and so far as I can tell some network traffic may be involved.
Has anybody else experienced this and don't anybody have any advice for avoiding it - particularly when I am giving demonstrations TIA