Game Center Groups
===

I had a paid app on the App Store with Leaderboards and Achievements and everything worked fine.
I then wanted to create a lite version for this app.
I thought it would be cool if this free app shared Leaderboards and Achievements with the paid app.
On iTunes Connect I saw the option "Move to Group" in the "Manage Game Center" section of my paid app.
I thus followed the instruction reported in the "Moving App Data to Groups" section on this page:
https://developer.apple.com/library/ios/#documentation/LanguagesUtilities/Conceptual/iTunesConnect_Guide/15_GameCenter/GameCenter.html
I decided to move all Leaderboards and all Achievements to the group. Therefore, all the IDs were added a "grp." prefix.
Then I added the free app to the same group and I chose which Leaderboards and which Achievements of the group I wanted for the free app.
 
The thing is that now both my apps are on the App Store and everything works fine for the Leaderboards but not for the Achievements!
Trying to figure out what was wrong I used the loadAchievementsWithCompletionHandler method to request the local player's progress on achievements and.. Surprise! The method is able to find only 17 of the 29 Achievements that are supposed to be on Game Center.. Moreover, the IDs of these Achievements are the "old" ones, without the "grp." prefix! But if I go to iTunes Connect I can see that all the group Achievements are attached to the game! What did go wrong? It seems that the Achievements have not actually been moved to the group but they have been maybe copied: in fact on iTunes Connect I can also see that the points that I used for the Achievements are twice the points that I actually used!
(The same thing holds for the Leaderboards: it seems I used twice the Leaderboards I actually used.
For the Leaderboards things work fine anyway, though.)
 
I cannot delete Achievements because they are now Live and I am not able to see the "old" Achievements (without the "grp." prefix) because they are supposed to have been moved to the group Achievements (with the "grp." prefix). I cannot even remove the apps from the Game Center group. Any ideas? What can I do?