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Sounds like it logs in correctly but doesn't sync or connect to our system so it gets synced with the other device.
Give these steps a try:
-First delete the game app again by going to Settings > Apps/ Application manager > Candy Crush Saga and tap 'Uninstall'
-Stay in Settings > Apps/ Application manager and tap the 'Google Play Store'
-From here click on 'Clear cache' then 'Uninstall updates’ and finally 'Clear data'. Please notice that you will get a warning when clicking the 'Clear data' button - don't worry as it's just a reset.
-Restart the device and download the game again.
-Finally open the game and reconnect it to your King account and see if it syncs properly now