Question [Q] Issue in cynogen mod 11

I have some app in folder at homescreen, while opening the folder i notice a small lock icon, i pressed the lock icon it ask me for a pattern i confirm pattern as soon as. Then whenever i touch folder it ask me for pattern and then show me app in folder .
Today when i open folder i have notice a small x icon in front of app and as soon as i pressed x icon my app is gone even from app drawer, i reinstall it from play store then even my application icon is not showing in app drawer. Any one know how to fix this issue.