If the HP/MP text is long enough, it wraps to the next line. If you are on desktop and fighting 3 enemies at once (eg. in a level 80+ Challenge where they might have lots of hp) then the overflow pushes information off the bottom of the screen where it is no longer visible.
Slightly related but not as bad, is that even with no overflow, 3 enemies at once will push the XP bar off the bottom making it impossible to tell your percentage through the level.
If the HP/MP text is long enough, it wraps to the next line. If you are on desktop and fighting 3 enemies at once (eg. in a level 80+ Challenge where they might have lots of hp) then the overflow pushes information off the bottom of the screen where it is no longer visible.
Slightly related but not as bad, is that even with no overflow, 3 enemies at once will push the XP bar off the bottom making it impossible to tell your percentage through the level.