On my previous iPhone that happened when you changed font.
more importantly what theme is that your using?
The theme is from dBar. Slightly modified by myself. Along with Principium HD
It isn't really an issue. I quite like it for teh lulz.
All your battery are belong to me.
It's your ui images folder that's causing the problem . Most themes from Dbar do that especially the ones made by Tizzle. So just delete your UI popup and everything will be ok.