Text suddenly disappears or cannot be moved to certain area of the page

I recently ran into a problem in the Charts app where text I enter at the very top or bottom of the song sheet—when zoomed in—disappears or isn’t written at all. If I type it closer to the center of the screen, it disappears when I move it all the way to the top or bottom of the page.
This problem doesn’t seem to occur when I zoom out of the song sheet. Then I can write text normally.