The positioning of text in this pop-up seems wrong: it's pushed way down.
This is the message shown after each downvote to a user under 2000 reputation. Screenshot from Opera 26 on Android 4.4.
I can also reproduce the above in a desktop browser (Chrome) by switching to mobile theme and reducing the width of the window. When the window is wide enough to avoid linebreaks, the issue disappears:
The same Opera 26 / Android combo shows other such messages correctly: