Unhappy [Q] PAC-MAN Rom 4.4.2 xperia ray Bug???

Hi guys...im using Xperia Ray with pac-man 4.4.2 rom.
I moved some apps to sd-card but the problem is everytime when i reboot the device,the icons of these apps get disappear from the front screen and i have to go to all-apps menu to launch them however other apps from internal memory remain in their positions.
can anyone tell me what is the problem. Is this a bug?