The sideloaded games do not load game center accounts but create new IDs. You need to save your game with other options and try, maybe Facebook did not try. It is an issue I fought much, nothing can be done. It's sideloading issue with save game data.
if you have old game and logged out or changed IPA, you might have lost your old save data, which was never saved on iCloud on your account, since you sideloaded the game. Check sideloadly issue on the main topic about save game data.
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