I noticed this too, but only with some of the icons.
Looks like it does that with every icon from apps that have been transferred to the SDcard.
I then tried to backup the home screen with "MyBackup Root", so I can restore it afterwards, but apparently, this feature doesn't like 4.4.x roms...
Oppo Find 5 Midnight 32GB
OmniROM 4.4.2 - NIGHTLIES