Recently Experienced the Same Issue. Was finally resolved after 13 Hours. 1st: Submitted Report of Problem with Photo Proof Attachment to Game App Developer. 2nd: Deleted Game App, DownLoaded Same Game App in the App Store Game Center Account. Still Signed In Wrong Account. 3rd: Looked Up OnLine Help of this Issue. Was brought here to this Apple Community Forum. 4th: Selected Posted Link & Contacted Apple Chat Support and Reported Issue. Case was Escalated to Phone Support. 5th: Received Apple Phone Support Scheduled Call Back. Apparent that it's fault of the Game App no longer Signing in Chosen Game Center Account. Advised to: 1. ReDelete Game App & ReDownLoad Game App using same Game Center Account ID. Did so again, Problem repeated. 2 Leave a Review on Game App Page in App Store detailing the problem. Try Signing Out of Game Center Account in App Store, then ReSign in, Then ReDownLoad Game App, ReSign in with Game Center Account again. If doesn't work, Fully Sign Out of Apple ID Account in General Settings, ReStart Device, Then ReSign In both Apple ID & Game Center Accounts in General Settings, Return to App Store & ReDownLoad Game App under Same Game Center Account ID. 6th: Did Advisement 3. Signed Out Own Game Center Account, Then Signed Out another Family Sharing Member's Game Center Account in App Store, Then ReSigned in Own Game Center Account, ReDownLoaded Game App under Purchase History, Game App LogIn, Successfully Signed in with Game Center Account Own ID...Finally! ♥ ^_^ ♥

Recently Experienced the Same Issue. Was finally resolved after 13 Hours. 1st: Submitted Report of Problem with Photo Proof Attachment to Game App Developer. 2nd: Deleted Game App, DownLoaded Same Game App in the App Store Game Center Account. Still Signed In Wrong Account. 3rd: Looked Up OnLine Help of this Issue. Was brought here to this Apple Community Forum. 4th: Selected Posted Link & Contacted Apple Chat Support and Reported Issue. Case was Escalated to Phone Support. 5th: Received Apple Phone Support Scheduled Call Back. Apparent that it's fault of the Game App no longer Signing in Chosen Game Center Account. Advised to: 1. ReDelete Game App & ReDownLoad Game App using same Game Center Account ID. Did so again, Problem repeated. 2 Leave a Review on Game App Page in App Store detailing the problem. Try Signing Out of Game Center Account in App Store, then ReSign in, Then ReDownLoad Game App, ReSign in with Game Center Account again. If doesn't work, Fully Sign Out of Apple ID Account in General Settings, ReStart Device, Then ReSign In both Apple ID & Game Center Accounts in General Settings, Return to App Store & ReDownLoad Game App under Same Game Center Account ID. 6th: Did Advisement 3. Signed Out Own Game Center Account, Then Signed Out another Family Sharing Member's Game Center Account in App Store, Then ReSigned in Own Game Center Account, ReDownLoaded Game App under Purchase History, Game App LogIn, Successfully Signed in with Game Center Account Own ID...Finally! ♥ ^_^ ♥