That's strange. I've just tried and I can confirm it's the same for me.
I'm also on android and for most apps this is something controlled in the system settings and I'm pretty sure is managed by the OS and not individual apps.
I wonder what jerboa is doing differently..
I also notice that the formatting buttons and the second half of the text box go off screen, underneath the keyboard as I type.
I wonder if there's a repo or an issue tracker where we can better report these things?