Different devices, different app versions!?

The recent changes in rating system caused something: in my tablet, the shown rating is now unchanged. Because it remains in the old pool in 10 min matches. I installed the app in my phone and found out it installs a whole new versions where the rating is shown correctly. 

I uninstalled the app from my tablet and reinstalled and... still installs the older version. I don't know how to correct this :-(

It is very possible the newer app isn't supported on your tablet OS version.

True but that should result in the absence of installation, as happens with other apps. As it is, I am doomed to either stop playing or see an outdated ranking forever 

The old app still pairs and rates the games correctly, just doesn't show the correct rating. So you can play and ignore that and have the same games.