I solved the problem myself. I had a game installed on SD card named, Hambo, I shifted it to phone and all apps, came back to their place, what else change I did earlier was to remove updates of Android market app. So google play was removed and then I did the only change of moving one app. tofrom SD card to phone and my problem was solved. I don't know actual reason of problem but based on what I read some where I think it was may be waiting for some update or change in some installation after the uninstallation of play update. So when I shifted an app to phone, all old things restored at their place.