App icon duplicated with a 'grayish' overlay on iPhone 6 with iOS 8
Solution 1:
This happens sometimes when an app installation or update fails and SpringBoard still shows the icon from cache.
To fix it, try any of the following:
- Sometimes, holding down on any icon to start edit mode, then tapping the × to delete the placeholder will work fine.
- Reboot—this clears SpringBoard cache.
- If your device is jailbroken, run
uicacheas mobile, then respring.