Unable to update games via Playstore.

I'm having strange issue. I'm not able to update games via Google Playstore. Earlier this month I had Subway Surf installed and when I got update of the game on Playstore after downloading everything instead of installing the update the download started all over again. I thought it was some error in my connection so I stopped the process suddenly the mobile soft rebooted. Same thing happened with Clash of Clans. Both the games were on SD card. Even after moving the games to internal memory same issue happening. Even tried changing preferred installation location to internal, then also nothing changed. It only happens with both the games (I haven't installed any other games). I've updated other apps like Facebook etc without any problem.
Was able to update Clash of Clans by sideloading the apk file.

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