[cessil]

it's possible the code is cancelled before it reaches the part where it changes the variables, the rest seems fine.
post the whole OnPlayerDeath

Code:

GetPlayerName(id, PlayerName, sizeof(PlayerName)); 
    
   format(String, sizeof(String), "Player Name: %s | ID: %d | Kills: %d | Deaths: %d", PlayerName, id, gKills[id], gDeaths[id]);

I missed the playerid's you should change them to id