signing corona sdk android apk

hello developers i have created a game in corona sdk free edition.now i want upload it on play store.i compiled the game for android.and signed my apk using commandline.now after uploading it on google play it shows that is is not signed it is debugable.but when i enter commands to check whether apk is signed or not it shows it is siogned.now i applied 2nd method for signing an application by using zipsignar.it completely signed the application.i checked on command line.it shows me my certificate but on google play it shows again the apk is debugable what is problem.