Leaderboards not showing all updated scores when sending scores via endMatchInTurnWithMatchData:scores method - objective-c

Question

I want to implement ELO rating system for a game. It means that after ending a game, I have to calculate increase for winner and decrease for looser from their actual score.
I have leaderboard of type "Most Recent Score" to see just the last sent score.
I use loadScoresWithCompletionHandler for loading score, then calculation (now just adding different values) and then endMatchInTurnWithMatchData:scores:achievements:completionHandler: for ending the match and updating the score.
GKTurnBasedParticipant* player1 = [match.participants firstObject];
GKTurnBasedParticipant* player2 = [match.participants lastObject];
GKLeaderboard *leaderboardRequest = [[GKLeaderboard alloc] initWithPlayerIDs:#[player1.playerID, player2.playerID]];
leaderboardRequest.timeScope = GKLeaderboardTimeScopeAllTime;
leaderboardRequest.identifier = LEADERBOARD_ELO_RATING_ID;
[leaderboardRequest loadScoresWithCompletionHandler:^(NSArray *scores, NSError *error) {
if(error){
NSLog(#"%#", error);
return;
}
GKScore *player1Score = [scores firstObject];
GKScore *player2Score = [scores lastObject];
float score1 = ((float)player1Score.value) / 1000.0f;
float score2 = ((float)player2Score.value) / 1000.0f;
// calculation of new score
score1 +=10;
score2 +=1;
GKScore *player1NewScore = [[GKScore alloc] initWithLeaderboardIdentifier:LEADERBOARD_ELO_RATING_ID forPlayer:player1Score.playerID];
GKScore *player2NewScore = [[GKScore alloc] initWithLeaderboardIdentifier:LEADERBOARD_ELO_RATING_ID forPlayer:player2Score.playerID];
player1NewScore.value = (int64_t)(score1 * 1000.0f);
player2NewScore.value = (int64_t)(score2 * 1000.0f);
[match endMatchInTurnWithMatchData:[game.board matchData]
scores:#[player1NewScore, player2NewScore]
achievements:#[]
completionHandler:^(NSError *error) {
if(error){// todo handle error
}
}];
}];
Getting score and uploading the new score works fine but when I go to see leaderboards (using GKGameCenterViewController or GameCenter app) I can see updated score only by the local player (the participant who has ended the match and sent the final data). But if I do a request by loadScoresWithCompletionHandler method - I can see that scores of both players were updated - but only the local player's is displayed in leaderboardController.
Example:
Match started:
Player A - 10 pts
Player B - 10 pts
Match ended (Player A sent these scores using method endMatchInTurnWithMatchData:scores:achievements:completionHandler:):
Player A - 15 pts
Player B - 8 pts
Match ended - loadScoresWithCompletionHandler result shows scores:
Player A - 15 pts
Player B - 8 pts
Match ended - GKGameCenterViewController or GameCenter app shows scores:
Player A - 15 pts
Player B - 10 pts
Why is this happening, am I doing something wrong? Is it because of using Game Center sandbox? Otherwise how should I exactly update score of both players by endMatchInTurnWithMatchData:scores:achievements:completionHandler:?

Answer 1

I found out, that it could be probably just because of using Game Center Sandbox.