Score (high score text) now showing on some mobile devices.

Hi everyone. I been having some strange problem with uploaded APK. For some reason the shipping build is not showing Score text (high score) on some devices. So far both tablets has failed to show text and they wont read the score from the lederboard. I have test the game on some one else Galaxy phone and it’s working great. Also on my developers Galaxy S6 edge wasn’t showing score either until I change it to OBB separately instead of packaging it inside APK. So now it works. I did skip App signing on Google Play since I been having score not showing on larboard but don’t know if that was the really the problem. I reallized later on I had some things missing in my project settings. Does any one know if App signing has something to do with it. Just confused on why two of my Tablets wont show in game Score. Help. Thank you!!!